prep2-6 :跪求解答！？？？？？？

Which of the following most logically completes the passage?

Garnet and RenCo each provide health care for their employees.  Garnet pays for both testing of its employees' cholesterol levels and treatment of high cholesterol.  This policy saves Garnet money, since high cholesterol left untreated for many years leads to conditions that require very expensive treatment.  However, RenCo does not have the same financial incentive to adopt such a policy, because __________.

(A) early treatment of high cholesterol does not entirely eliminate the possibility of a stroke later in life

(B) the mass media regularly feature stories encouraging people to maintain diets that are low in cholesterol

(C) RenCo has significantly more employees than Garnet has

(D) RenCo's employees are unlikely to have higher cholesterol levels than Garnet's employees

(E) the average length of time an employee stays with RenCo is less than it is with Garnet

我已经理解为什么是E，但是我认为D也可以，正因为renco的员工不可能有这个毛病，所以他们才不会采取这个策略，我认为也行得通，只想知道D错在哪里？--求高手解答

啊啊啊啊

hmm，d给我的感觉不是很好那。

d说“不可能比G更高”，也就表明有可能和G是一样的，如果是一样的话，那么就不能作为R不采取体检措施的原因啦