确认订单的常用表达 — 国际贸易选择题

卖方收到买方订购800双皮手套的Order No. 906后拟复函确认接受。以下四个句子中，属于确认订单的规范常用表达、语气礼貌且信息完整无歧义的是哪一项？ A. We are pleased to confirm our acceptance of your Order No. 906 for 800 pairs of leather gloves. B. Your order is OK, we will think about the shipment soon. C. We have received your order, but we don't know if we can accept it. D. Please send us a new order because we lost your Order No. 906.