求助一题，牛牛们帮帮忙，不胜感激

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.

哪位大牛能解释一下呢？这题我实在没搞清楚

(A) for speeding it up.错

C D E 中WHICH修饰错误

to表目的，不用for

A)with 介词短语做修饰语时要贴近对象,而这里显然不是修饰“attrition”

CDE 用宾语从句，使句子本意表达有误。另C不能speed up “attrition”，而是speed up a process