Identify the sentence where the pronoun agrees in number and gender with its antecedent (that is, the word the pronoun stands for).

a. To get a temperamental actress to sign a contract, the director would lock them in the dressing room.
b. To get a temperamental actor to sign a contract, the director would lock them in the dressing room.
c. To get a temperamental actress to sign a contract, the director would lock her in the dressing room.