—Must I return the hook tomorrow morning? —No, you _ .You can keep it longer.

A．mustn't

B．can't

C．needn't

D．couldn't

营业网点柜员在对经分析认定为高风险等级的个人及单位客户，应在高风险客户的账户开立（）个工作日内完整填写《河南省农村信用社高风险个人客户认定表》。

A.5

B.10

C.15

D.20