求教GWD逻辑题一道！！

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GWD3-Q8:
Which of thefollowing most logically completes the passage?
Garnet and RenCo eachprovide health care for their employees. Garnet pays for both testing of its employees’ cholesterol levels andtreatment of high cholesterol.  Thispolicy saves Garnet money, since high cholesterol left untreated for many yearsleads to conditions that require very expensive treatment.  However, RenCo dose not have the samefinancial incentive to adopt such a policy, because ______.
A.   early treatment of high cholesterol dose notentirely eliminate the possibility of a stroke later in life
B.   the mass media regularly feature storiesencouraging people to maintain diets that are low in cholesterol
C.   RenCo has significantly more employees thanGarnet has
D.   RenCo’s employees are unlikely to havehigher cholesterol levels than Garnet’s employees
E.    the average length of time an employee stayswith RenCo is less than it is with Garnet


答案选E，可是我怎么都觉得A也是对的啊。。。求大虾指点！