The opposite of Potent is Feeble
“If you think about it, ballet is just another kind of language, except that you talk with your body instead of with your mouth.”
-Jessi, Jessi’s Secret Language
Because dance is such a powerful way to communicate where words are not needed.
any opposition between characters
C) is not a goal in informative speaking
From my understanding, a dangling modifier is a word or phrase that makes the sentence or ambiguous or not clear.
I would choose C.
Can the rain fall happily? I think "while" should be placed before happily to clear who's doing the action happily. Hope this helped!