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A major impediment to wide acceptance of electric vehicles even on the part of people who use their cars almost exclusively for commuting is the inability to use electric vehicles for occasional extended trips.  In an attempt to make purchasing electric vehicles more attractive to commuters, one electric vehicle producer is planning to offer customers three days free rental of a conventional car for every 1,000 miles that they drive their electric vehicle.

那位好心人帮我翻译一下题目的意思！

Which of the following, if true, most threatens the plan's prospects for success?

Which of the following, if true, most threatens the plan's prospects for success?

(A) Many electric vehicles that are used for commercial purposes are not needed for extended trips.

(A) Many electric vehicles that are used for commercial purposes are not needed for extended trips.

(B) Because a majority of commuters drive at least 100 miles a week, the cost to the producer of making good the offer would add considerably to the already high price of electric vehicles.

(C) The relatively long time it takes to recharge the battery of an electric vehicle can easily be fitted into the regular patterns of car use characteristic of commuters.

(D) Although electric vehicles are essentially emission-free in actual use, generating the electricity necessary for charging an electric vehicle's battery can burden the environment.

(E) Some family vehicles are used primarily not for commuting but for making short local trips, such as to do errands.

推广电动车的最大障碍，就算是对那些只上下班用车的人来说，是无法解决电动车用户偶尔远行的需求。为了让电动车更加吸引顾客，一个电动车生产厂家打算提供给他的客户每1000英里电动车旅程赠送3天免费用正常车的计划。下列那个，如果成立，最能使的这个厂家的计划落空。

正常车，潜在用户