An antecedent is
a. the verb that shows the action in the sentence.
b. the noun or pronoun to which a pronoun refers.
c. an adjective that appears after the noun it modifies.
d. the noun that completes a prepositional phrase.

B. the noun or pronoun to which a pronoun refers.

The noun to which a pronoun refers is called the antecedent of the pronoun.   A pronoun is used to substitute a noun. In order for it to substitute, it must have a clear antecedent. Personal pronouns are used to substitute nouns with ownership. There are three persons point of view.1st person is when the subject is the one who is speaking (e.g. I, me, my, mine, we, us, our, ours). 2nd person is when the subject is the one being spoken to (you, your, yours). 3rd person is when the subject is the one spoken about (he, him, his, she, her, hers, it, its, they, their, theirs).

Ithink the answer would be d.