I think its smells I'm not sure tho
Answer: The mood is warm and welcoming
The correct answer is D, because there are three independent clauses in this sentence, all of the clauses are independent. A means that there is at least one dependent clause, which is not the case here, and B means the same. C mean that there is only one independent clause in the sentence.
I get a serious vibe. I really hope this guides you to the right answer c;