交流滤波器小组的投切优先级顺序为（）。

A.交流母线电压要求>谐波要求>无功要求

B.谐波要求>交流母线电压要求>无功要求

C.无功要求>谐波要求>交流母线电压要求

D.无功要求>>交流母线电压要求谐波要求

His explanation was so clear that everyone could understand it with ________.

A．the least effort possibly

B．possibly the least effort

C．the possible least effort

D．the least possible effort