To her joy, Della earned first the trust of her students and then ____ of her colleagues.

A．one

B．ones

C．those

D．that

某进口设备的到岸价是100万美元．外汇牌价：1美元=8.28元人民币。国外运费率6%。国外运输保险费率2.66%，进口关税率22%，进口环节增值税率17%，外贸手续费率1.5%，银行财务费率0.4%，则外贸手续费为( )万元。

A．17.73
B．15.15
C．12.42
D．11.69