白勇P238-27

The labor agreement permits staff reductions through attrition with increased pension benefits and a special early-retirement program for speeding it up.

A)      attrition with increased pension benefits and a special early-retirement program for speeding it up

B)      attrition and provides increased pension benefits and a special early-retirement program to speed the attrition process

C)     attrition, which will be speeded up by providing increased pension benefits and a special early-retirement program

D)     attrition, which, by their providing increased pension benefits and a special early-retirement program, will speed the process

E)      attrition, which provides increased pension benefits and a special early-retirement program for speeding the attrition process

我选的是C，答案B我没看出是什么跟什么并列，attrition and provides。。。应该也不能并列啊，请教高手