Adjectives nouns and pronouns.

a. highlight

b. emphasize

c. modify

d. replace

Adjectives modify nouns and pronouns. The correct answer is C. To modify means to describe, so adjectives are used to describe noun more thoroughly, using more details. So for example, when you say a young girl, the adjective young modifies the noun girl. Adjectives do not highlight or emphasize the noun (those two words mean the same, by the way), and they do not replace them - pronouns do.

Step-by-step explanation: