信函语气与礼貌策略 — 国际贸易选择题
题目
向老客户致函通知价格上涨时，以下哪一句的语气最符合英文商务信函的礼貌策略与You-attitude原则？
A. We regret that our prices will be increased next month.
B. Our prices have to be raised due to rising costs.
C. To serve you better, we will offer you a 5% discount on all orders placed before May 1, before the new prices take effect.
D. We are forced to raise prices because suppliers keep increasing their charges.