A.
early treatment of high cholesterol dose not entirely eliminate the possibility of a stroke later in life 不能消除也能抑制，无关选项

B.
the mass media regularly feature stories encouraging people to maintain diets that are low in cholesterol  可以理解为Renco鼓励人们吃低胆固醇的食品所以间接抑制了发病率所以不需要那个政策

C.
RenCo has significantly more employees than Garnet has 人多所以可能平时检查的钱太多了就不如直接治病来的划算

D.
RenCo’s employees are unlikely to have higher cholesterol levels than Garnet’s employees 直接说了renco没有那么多高胆固醇的人当然不用那个政策

E.
the average length of time an employee stays with RenCo is less than it is with Garnet 是答案也有道理

要是用排除法一个是E也可以被排除，是不是我想太多了，但是就是觉得bcde都有理由，请指点