Answer:
<u>b. Pronoun</u>
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:
<u><em>Kate</em></u><em> is an excellent student, I admire </em><u><em>her</em></u><em>.</em>
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."
<u><em>Mario</em></u><em> always stays up until late at night, but </em><u><em>he</em></u><em> always wakes up at 6 a.m.</em>
Here, <em>he</em> is a subject pronoun because it replaces de noun <em>Mario</em> while acting as the subject of the sentence as well.