Question

Caves under the water can be formed in different ways. Which of these phrases is an adjective phrase? A. can be formed B. under the water C. Caves under the water D. in different ways

Answer 1

I think it's b. because it clarifies what type of caves you are talking about.

Answer 2

Adjectives are the words which qualify the noun or pronoun. Therefore, Adjective Phrase refers to the modification of noun or pronoun in a sentence with group words. In the sentence "Caves under the water can be formed in different ways."  adjective phrase is B. under the water as it modifies the noun "caves."