The hybrid version of an automobile costs $4000 more than the gasoline version of the same model of automobile.  The hybrid version averages 42 miles per gallon of gasoline and the gasoline version averages 28 miles per gallon.  Assuming that gasoline will cost $4 per gallon and that you will drive 14,000 miles per year, how many years will be required for you to make up the extra original purchase cost in savings on the cost of gasoline.单项选择题

A

3

B

1

C

12

D

6

E

2

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