What’s the correct answer?

But. If their favourite flowers are lillies, you'd expect their husband to buy them lilies. Here, the husband is buying a flower that isn't their favourite, and it's because of that contrast you use "but".

But

But for sure.

But. Just replace the word “but” with “however” in your head and it will make more sense.

Purely grammatically both are correct, but yes, for reasons already mentioned the answer is but.

But would be the expected conjunction here, but I believe that and is still grammatically correct. Using but says that the expected choice of flowers should be lilies instead of roses. If the writer's goal is not to imply that the husband made a bad choice, then instead of and I would have made two separate sentences. My husband always buys me roses. My favorite flowers are lilies. Those two sentences could still be spoken with snark to effectively give the same result as using but as the conjunction.

Either can be correct, depending on the context. A is more common, though.

"But" is the certainly the better answer. However "and" could also work here, and it changes the tone slightly. It would make it less of a complaint and more of an ironic observation. But I don't think you'd technically use a comma in that construction (even though you'd probably pause dramatically when saying it aloud - you'd almost express this with an ellipsis: "My husband always buys me roses . . . and my favorite flowers are lilies"). It could almost be a lyric from an Alanis Morissette song that way. But, for sure, on a multiple choice question, I would 100% choose "but".

Both are correct, but a person would be more likely to say A than B.

But. However, yet is better

There are a few other possibilities, but all on the theme of contrast… although, whereas, yet… Maybe slightly different nuances. ‘But’ is the obvious answer.

But

"But" is the best answer here, but I'm going to surprise you to say that you can also say "and" and be grammatical. It gives the sentence a surprising, stylistically interesting cast. It subtly suggests that the husband knows what she likes, but goes out of his way to avoid pleasing her.

I see a lot of answers stating that "and" could be correct too and that surprises me a lot. Is that really the case? I would have guessed that if one were to use "and" in that sentence there would be no comma after "roses".

and

"But" is the correct answer and that comma has no place in that sentence.

But. The comma indicates a subordinate clause. ‘And’ wouldn’t require a comma.

but because he doesn't like roses. but shows contradiction relationship

"But". Synonyms here are "however" and "yet". It *really* triggers me that in this specific case they didn't list it as "A. and" and "B. but".

This is called cohesion in writing. Recommend watching [this video](https://www.youtube.com/watch?v=TScPcKfQ9ds) to learn more about this topic.

I think they’re looking for people to pick “but,” so that’s what I would choose, but “and” isn’t actually incorrect. Using “but” makes the sentence a straightforward complaint about an inattentive husband, but I could see someone using “and” wryly — as if they’re just stating two facts that may or may not be related, but the juxtaposition is there

But You can also use 'Yet'.

They're both grammatically correct. Given the context, "but" is probably the answer they're looking for.

But