Answer:
b. Pronoun
Explanation:
A pronoun is a word that substitutes a noun or noun phrases. There are many types of pronouns, one of them is personal pronouns which can be divided into subject pronouns (when they replace nouns that act as subjects) and object pronouns (when they replace nouns that act as objects).
Here are some examples of how they work:
Kate is an excellent student, I admire her.
In this sentence, her is an object pronoun because it acts a substitute of the noun "Kate" and it receives the action of the verb "admire."
Mario always stays up until late at night, but he always wakes up at 6 a.m.
Here, he is a subject pronoun because it replaces de noun Mario while acting as the subject of the sentence as well.
