请教您:大全674 A)

679.   Studies of the human “sleep-wake cycle” have practical relevance for matters ranging from duty assignments in nuclear submarines and air-traffic control towers to the staff of shifts in 24-hour factories.

(A) to the staff of

(B) to those who staff

(C) to the staffing of

(D) and staffing（C）

(E) and the staff of

请问:the staff 和the  staffing 有什么区别么?该怎样使用呢?谢谢!

这里from A to B，duty assignment 和 the staffing平行更合适，强调动作；和the staff全体职员逻辑意思上不平行