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?

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

请问C项是什么意思？

谢谢

电动车被普遍接受的障碍在于:即使对于依靠轿车作为专门的交通工具的人来说,偶然想用电动车外出都不行。为了引起经常往返的人（即上文所说的依靠轿车作为专门的交通工具的人）对电动车购买更大的兴趣，一个电动车商计划当顾客用电动车行驶了1000公里时，可以免费租用传统汽车3天

C相对长时间的充电可以被适合于使用电脑特征的一般模式的汽车。好像自己感觉也不通。