Answer:
She is an active girl who loves to play sports.
Explanation:
A pronoun is a word that renames a noun within a sentence; it can be personal, like <em>you, me, she, they, </em>etc; demonstrative, like <em>that, those, </em>etc; interrogative, like <em>who, what, which, </em>and many more. An antecedent is the word (usually a noun) that the pronoun refers to; it is usually placed before the pronoun within a sentence.
However, in sentence C, you can see that the pronoun she is placed <em>before </em>the antecedent girl that it refers to. This does not happen in the other examples.