The boy often _________basketball after school. But now he _________piano.

A．plays; is playing the

B．play the; plays

C．is playing the; is playing

D．plays the; is playing

侵犯他人同意权的合同效力判断属于以下哪一项法律的判断范畴（）

A、产权法

B、行政法

C、公司法

D、合同法