Identify the sentence in which the underlined word is a gerund.

Варианты ответа

1. A.The teacher asked them to finish their assignments quickly.
2. B.After swimming for an hour, they felt refreshed.
3. C.She enjoys reading books late into the night
4. D.Running on the beach is his favorite form of exercise.верно
5. E.The dog barked loudly, startling everyone in the room.