单项选择题

A.提前10天付款优惠0.3%,提前20天付款优惠0.5%,提前30天付款优惠1%
B.提前10天付款优惠0.3%,提前20天付款优惠0.5%,提前30天付款优惠0.9%
C.提前10天付款优惠0.2%,提前20天付款优惠0.4%,提前30天付款优惠0.8%
D.提前10天付款优惠0.2%,提前20天付款优惠0.5%,提前30天付款优惠0.8%