Hello

I have a Q from OG12 that I need some help with

Dirt roads may evoke the bucolic simplicity of another century, but financially strained townships point out that dirt roads cost twice as much as maintaining paved roads.

(A) dirt roads cost twice as much as maintaining paved roads
(B) dirt roads cost twice as much to maintain as paved roads do
(C) maintaining dirt roads costs twice as much as paved roads do
(D) maintaining dirt roads costs twice as much as it does for paved roads
(E) to maintain dirt roads costs twice as much as for paved roads

I understand the comparison in A is between the dirt roads and maintenance and hence its wrong. I understand the reason that OA is B. But i am unable to get why is D wrong? I cant find a reason to eliminate it.

Is it maintaining and 'does'?
thanks in advance!