Final answer:
The appropriate direct object pronoun in this sentence is la.
Step-by-step explanation:
The appropriate direct object pronoun in this sentence is la. When someone asks "Tu veux ma glace?" (Do you want my ice cream?), they are offering their ice cream to the other person. So, when the other person responds with "Oui, je veux," (Yes, I want), they are using the direct object pronoun la to refer to the ice cream.
Example:
Tu veux ma glace? (Do you want my ice cream?)
Oui, je veux la. (Yes, I want it).
Learn more about Direct object pronouns in French