771 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[/u]
(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
Can someone please explain why the answer is B insread of C?