Final answer:
In Cyrano de Bergerac, Christian decides to speak for himself in order to impress Roxane and prove his intelligence and love for her. He may also be tired of Cyrano speaking for him and wants to assert his own voice.
Step-by-step explanation:
In Cyrano de Bergerac, Christian decides to speak for himself for several reasons. One of the main reasons is that he wants to impress Roxane, the woman he loves. By speaking on his own behalf, Christian hopes to prove his intelligence and show his love for Roxane. He also may be tired of Cyrano constantly speaking for him and wants to assert his own voice and agency in their interactions.