This sentence is grammatically correct but it is not adverb phrase it is Syntax
Answer:
I don't know the options but I would say identifying the main idea
Explanation:
Adverbs are words that are typically used to describe verbs(or actions). In the sentence, “Jack was talking loudly.” Loudly is the adjective/ modifier of the verb talking.
Rainsford had an epiphany at the end of the story when he was being hunted by General Zaroff. The external conflict was General Zaroff hunting him. His epiphany was about how animals felt when they were being hunted because, in the beginning of the story, he said that animals don't feel fear when hunted. At the end of the story, he understood how it felt to be hunted like an animal and that they do feel fear.