Answer:
C)The adjective phrase “really long and detailed” modifies the word “it.”
Step-by-step explanation:
Adjective phrases are group of words standing together as a unit and containing at least one adjective and, sometimes, modifiers and complements, whose function is to modify, describe, or gives information about nouns. In the sentence, the adjective phrase is “really long and detailed” because it contains two adjectives: “long” and “detailed” and modifiers of those adjectives. Furthermore, it modifies and provides more information about “it” (the text).