单项选择题

A.20%~25%:25%~30%:50%~60%
B.10%~15%:20%~35%:50%~60%
C.10%~25%:25%~30%:50%~60%
D.10%~15%:25%~40%:50%~60%
E.15%~25%:30%~45%:45%~60%