合同修改与书面确认的表达 — 国际贸易选择题

买方来函要求将销售确认书第 S-812 号项下的交货期由 8 月提前至 7 月，其余条款不变。卖方复函表示同意并作书面确认。按照外贸函电惯例，确认函中应使用下列哪一表达？ A. We hereby confirm acceptance of the above amendment to Sales Confirmation No. S-812. B. We regret to inform you that the amendment cannot be considered. C. Please amend the confirmation at your earliest convenience without our confirmation. D. We shall open an L/C for the amended price terms immediately.