Answer:
some people think that healthy snacks lack flavor....
If you read each of these, or speak them, there is only one that suits the sentence correctly.
Go with the third one. Couldn't seems to fit pretty well there.
The answer is B, The relative pronoun is that; it functions as part of the adverb clause.
Formal writing is often used for academic and business work. It has a serious tone, facts, standard punctuation, and a third-person perspective. It does not include contractions, clichés or metaphors.
