请教大全-18-5，麻烦NN看一下~

请教大全-18-5

Under current federal law, employers are allowed to offer their employees free parking spaces as a tax-free benefit, but they can offer employees only up to $180 per year as a tax-free benefit for using mass transit. The government could significantly increase mass transit ridership by raising the limit of this benefit to meet commuters’ transportation costs.

The proposal above to increase mass transit ridership assumes that

(A) current mass transit systems are subject to unexpected route closings and delays无关

(B) using mass transit creates less air pollution per person than using a private automobile无关

(C) the parking spaces offered by employers as tax-free benefits can be worth as much as $2,500 per year不知道2500对于私车来说和800对于公交来说哪个更省，无从比较，如果本来私车开销巨高，公交开销很低那即使私车减免2500的停车费也不一定比工交减免得少要花的来。

(D) many employees are deterred使某人决定不做某事 by financial considerations from using mass transit to commute to their places of employment（D）

(E) because of traffic congestion on major commuter routes, it is often faster to travel to one’s place of employment by means of mass transit than by private automobile无关

请问NN我对C这样分析对吗？C怎么不行？谢谢！