24. 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（B）
(E) attrition, which provides increased pension benefits and a special early-retirement program for speeding the attrition process
请问c为什么不对呢？觉得b有改变句子重心的嫌疑
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