Final answer:
Christian taunts Cyrano because they are friends, and the taunting is in the spirit of camaraderie and jest that can occur between companions. The correct option is 4.
Step-by-step explanation:
Christian decides to taunt Cyrano because Cyrano is his friend. The dynamic between Christian and Cyrano in Edmond Rostand's play Cyrano de Bergerac is complex. While Cyrano does have feelings for Roxane, the same woman Christian loves, Christian is not aware of this and does not taunt Cyrano out of rivalry or insult.
Instead, Christian's teasing stems from a place of camaraderie and the lighthearted banter that can exist between friends. It is an example of the friendly rapport and the intricate relationships that Rostand paints between his characters in this classic work of French literature.