Final answer:
The correct answer is A. 'les'.
Step-by-step explanation:
The correct answer is A. les. In this sentence, the subject 'tú' is referring to the person who is giving the gifts, and 'les' is the indirect object pronoun used to show that the gifts are being given to 'tus amigos' (your friends). Indirect object pronouns indicate to whom or for whom an action is done.
Learn more about Indirect object pronouns in Spanish