确认订单的常用表达 — 国际贸易选择题

卖方收到买方订购450台豆浆机的Order No. 508，拟复函确认接受该订单。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 confirm our acceptance of your Order No. 508 for 450 soybean milk machines and will arrange shipment accordingly. B. Your order is OK with us. C. We received your order, but we are not sure whether we can supply the goods. D. We accept your order. Please pay at once without any delay.