10Points!Please Help!


Which words in the sentence make up the adverb phrase? Which words do the adverb phrase modify?


A herd of elephants can cover 50 miles a day during the summer.


A.can cover; modifies A herd of elephants

B.during the summer; modifies can cover

C.during the summer; modifies 50 miles a day

D.A herd of elephants; modifies can cover


I've narrowed it down to B and C