The correct answer among the choices is option D. The word "swiftly", which is italicized in the example, is an adverb. An adverb modifies a verb, an adjective or other adverbs. In the sentence, the verb modified is swim which is a verb.
Hi,
(I believe), that the one difference between Hamlet and Simba out of the options, is that <span>Hamlet ends up in love with a girl.
Faith xoxo</span>