You have already tried your best, so you _____ worry about the matter. [ ]

A. can't

B. needn't

C. mustn't

D. couldn't

关于货币政策的基本特征，下列表述不正确的是( )。

A．货币政策主要是直接调控政策

B．货币政策主要是间接调控政策

C．货币政策是宏观经济政策

D．货币政策是调节社会总需求的政策