When the policeman stopped us, we all looked questioningly at him, ________.

A．nervously and puzzled

B．nervous and puzzling

C．nervous and puzzled

D．nervously and puzzling

业务运营风险管理系统的设计遵循（）的原则。

A.统一控制

B.统一管理

C.分类控制

D.分类管理