If the answer is D, shouldn't it say "is done?"

Yes, you're right. C is the only answer that works. Does the answer key say it's D? If so, it's a bad test.

It should, yes. Of these options, I would pick C. 

agreeing with others; it's "C"

The correct answer is C, but you are right. .D would be correct if it read "is done".

I feel like I've heard examples like E in real life, but I'd hesitate to call it "correct" by formal definitions, though I can't quite put my finger on why. edit: I'm getting replies saying "it should use 'you' and the question be written in quotes", which *would* be correct and in line with modern usage, but this form can definitely be used using pronouns relative to the conversants as well, I'd say that's *more* traditional, if anything. again, there's still something I'm not quite comfortable recommending about this phrasing though. maybe it's just that it's *really* uncommon though.

You are correct. For answer D to work it would need to be “is done.” Otherwise the best answer is C.

I agree D is wrong and should be “is”. C is the most correct although I think you could argue that it should technically be “whether” rather than “if”, but in informal speech no one would bat an eye.

You are correct. D doesn’t work because the meat isn’t done yet, so you can’t use past tense. Until the meat is done. Exactly as you say. C is the only answer without a significant error in it.

They're all poor answers, D is just the 'least worst', in terms of 'etiquette', yet falls down on grammar. Yes, it should be 'is'. All the options are awkwardly phrased and not particularly idiomatic for such a social situation.

which book or material is that?

Was the question "which answer is most wrong?"?

I don’t mind A as an answer either. C is best. I’m a native speaker. Does A not work for others? It’s an odd sentence but I don’t see an issue. I like C better, but A works for me too…I’m sure there’s something I’m missing?

Yes, D is wrong. Your suggested correction is correct.

Should be either "is done" or "has been done" (latter is less commonly used but also correct I believe?). Answering by exclusion, C is the "least wrong", though would work best if "if" was replaced with "whether".

It shouldn't be D. The only answer that makes sense and is worded correctly is C.

The right answer is C.

In the first moment, I thought it was a passive voice, but actually, it must be "is", not "was", so I think you are right.

Yes.

Yes it should be a different order

Yeah, it should be "is." The test is wrong.

None of these answers sound natural. At all.

English teacher here. C is indeed the correct answer. The reason you cited is one reason that D isn’t the correct response.

C is correct. D can be corrected if it reads “…is done.”

A works grammatically, but it is strange in context (how would guests know the temperatures at your place?) Of the remaining answers, only C is grammatically correct

C is the only one that makes sense. D should be is, you are correct.

Confusing. A is correct American. C is correct but awkward, B is very awkward and looks like an AI translation. D has wrong tense, but seems odd because of the way it uses meat. Does it mean food, like Scandinavian “mat”? Or is supposed to mean until the meal is ready? E is strange to me too, here I’d expect “to enjoy a drink by the pool”.

Yes, It should be C. E might work, if there is a comma after “guests.”

C

To me, it seems like C is the correct answer

Answer is C

C and E seem pretty correct, with C sounding more correct, although using "will" instead of "would" here also feels wrong

personally, my favorite answer is A

With quotation marks A and E could be right.

"C" is the correct answer. I'm always getting asked if I prefer things 'mild' or 'spicy.' No one asks me 'whether' I want 'mild' or 'hot' spices. Also, you wouldn't have drinks in the garden, that's a social faux pas. There are way too many videos of low-class girls falling into bushes and shrubbery after too many drinks.

The answer key is just wrong. Don't try to make D correct because you'll just have two correct answers.

C is right. Some poindexter would prefer "whether " rather than "if", but if is fine, really.

In real life any of these would work

If the guests are here, it's too late to spice the beef stew. Must be a UK textbook.

Correct answer is C. If it was D, it should say "is done" (as you correctly point out)

C would be the correct answer.

C is the closest to right, but beef stew being spiced or unspiced is not a thing I've ever heard anybody say (I'm a native North American English speaker). If the stew were a spicy one (which is unusual, since beef stew usually does not contain hot peppers), you'd say something more like, "Would you please ask our guests if they want their beef stew to be spicy?" Or, really, "Ask them if they like it spicy," leaving the other details to be figured out from context. If I'm asking somebody to talk to "our" guests, they're somebody I'm very close to and will speak with in a very casual way.