Final answer:
De Guiche chooses the Gascons to face the Spanish attack in 'Cyrano de Bergerac' likely due to their reputations as strong fighters, aligning with his military objectives.
Step-by-step explanation:
In Act IV of Cyrano de Bergerac, de Guiche's primary purpose in choosing the Gascons to face the attack of the Spaniards is not explicitly stated in the choices provided. However, a possible interpretation based on the context of the play and historical references might suggest that de Guiche selects the Gascons, led by Cyrano and Christian, for their reputation as strong fighters, perhaps hoping they would be formidable in battle against the Spanish. De Guiche's motivations, largely influenced by his complex relationship with the main characters and his own aspirations for military success, could be interpreted as a strategic decision, leveraging the Gascons' combat skills to defend against the Spanish troops.