单项选择题

A.付汇金额=购汇金额+现汇金额+其他金额
B.付汇金额>购汇金额+现汇金额+其他金额
C.付汇金额<购汇金额+现汇金额+其他金额
D.付汇金额≤购汇金额+现汇金额+其他金额