单项选择题

A.2.1×(P/F,12%,1)+2.205×(P/F,12%,2)+22.05×(1+2%)×(P/F,12%,2)
B.2.1/(12%-5%)+22.05×(1+2%)×(P/F,12%,2)
C.2.1×(P/F,12%,1)+2.205×(P/F,12%,2)+22.05×(1+2%)×(P/F,12%,3)
D.2.1/(12%-5%)+22.05×(1+2%)×(P/F,12%,3)