| A major impediment to wide acceptance of electric vehicles even on the part of people who use their cars almostexclusively 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 
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