A adverb usually follows the verb, It can also precede the verb. Also a prepositional phrase functions as an adjective or adverb, and a prepositional phrase functions as an adjective or adverb. Also letting someone know you like them a lot just adds the adverb onto the verb. And being is an adverb and so it will always modify a verb in lieu of a noun.
I think the answer is either A. Why does Harry seem sad at the end of the passage. or D. Where will jack and Harry find work after the professor leaves?