The answer to the question above would be that the sentence in which the underlined pronoun is used correctly is the following one: She cooks better than them.
In the sentence in question, the underlined pronoun is "them". This is a personal pronoun in the objective case because it is used as an object. When used as an object, the pronouns can be either a direct or indirect object or the object of a preposition. In this case, it is the object of the preposition "than".
The answer is A, because the protagonist is the main character, and that's what Rider is. The other answers don't really make sense in terms of the role he plays in the story.
