I believe the answer is B. Not.
a conjunction is a word that connects sentences, phrases, or clauses. The words "but", "yet", and "so" all do that, and therefore, are conjunctions. The only word that isn't a conjunction is "not", so the answer is B. Hope that helps!
Some include:
Cause and effect: Consequently, therefore, accordingly, as a result, because, for this reason, hence, thus...
Sequence: Furthermore, in addition, moreover, first, second, third, finally, again, also, and, besides, further, in the first place, last, likewise, next, then, too, etc.
Parallelism hope this helps if not sorry not sorry
