OG233

. Recently implemented "shift-work equations" based on studies of the human sleep cycle have reduced sickness, sleeping on the job, fatigue among shift workers, and have raised production efficiency in various industries.

(A)  fatigue among shift workers, and have raised

(B)  fatigue among shift workers, and raised

(C)  and fatigue among shift workers while raising

(D)  lowered fatigue among shift workers, and raised

(E)   and fatigue among shift workers was lowered while raising

Why C not A? 这种题and放哪里我老是搞不清？