合同修改与书面确认的表达 — 国际贸易选择题

某出口公司收到买方来函，要求将销售确认书第 S-356 号项下的包装条款由「纸箱装」改为「木箱装」，其余条款不变。卖方复函同意该修改并予以书面确认。按照外贸函电确认惯例，复函中应写明：We confirm having amended the packing clause of Sales Confirmation No. S-356 (　　). A. as requested, all other terms remaining unchanged　B. all other terms changed as requested　C. with the packing clause remaining unchanged　D. and canceling all other terms accordingly