请教一道OG题

Kilroy

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.
Which of the following, if true, most threatens the plan’s prospects for success?
B) Because a majority 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.
我对这个electric vehicle producer的offer好象没看懂，那位解释一下？

tongxun

电动车制造商向驾驶他们制造的电动车的人提供，每驾驶电动车1000英里，免费租用一般的汽车3天，的政策。