Choose the correct word to complete the sentence: I gave her all the money ___ I had.

This question tests your knowledge of relative pronouns used to introduce restrictive clauses.

• Option C: That is the most appropriate relative pronoun here. "That" is commonly used to introduce a restrictive clause that provides essential information about the noun it modifies, in this case, "all the money." It clarifies which money was given.
• Option A: Whom is incorrect. "Whom" is an object pronoun used for people, and "money" is an inanimate object.
• Option B: Which can be used for things, but "that" is generally preferred for restrictive clauses (clauses essential to the meaning of the sentence) in everyday English. While not strictly wrong, "that" is a more natural and common choice here.
• Option D: Where is incorrect. "Where" is used to refer to places, and "money" is not a place.