The answer to your question would be that the sentence that demonstrates the correct use of a conjunctive adverb is the following one: Lisa cleaned the Kitchen this afternoon; meanwhile, Donovan dusted the living room.
In this case, the conjunctive adverb "meanwhile" has been used as a coodinating conjunction to join two independent clauses. You need the semicolon to connect the two clauses.
The sentence that would best support the claim that, in order to be healthier, teenagers should avoid sodas and snacks made with sugar is C. "Medical studies have recently demonstrated that consuming too much sugar is a risk factor for some diseases" would be your answer because the statement contains empirical evidence (it quotes medical studies) which is realiable information. It is a scientific fact; whereas for instance D, A and B are only opinions or stataments.
The answer is a, you know how usually people get mad and start mumbling, yeah that’s it