Which words in the sentence make up the adjective phrase?

what types of flowers are her favorite?

a.
types of

b.
of flowers

c.
are her favorite

d.
what types

The words in the sentence that make up the adjective phrase are: are her favorite. The correct answer is option C. An adjective phrase, consists of words that modify a noun just like an adjective. The subject of the sentence is "types of flowers" and the adjective phrase that describes the noun and the subject "types of flowers" is the phrase "are her favorite". 

Ais the correct answer.