The labor agreement permits staff reductions through 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
(E) attrition, which provides increased pension benefits and a special early-retirement program for speeding the attrition process 不太明白E错在哪里？难道是provide...for用法不对吗？一直觉得B也不对，把原来的修饰成分变成了句子的主干了。求NN解释啊！！！