请教：

sillybird

9. Technically a given category of insurance policy is
  underpriced if, over time, claims against it plus
  expenses associated with it exceed total income from
  premiums. But premium income can be invested and
  will then yield returns of its own. Therefore, an
  underpriced policy does not represent a net loss in
  every case.

The argument above is based on which of the fol-
  lowing assumptions?
  (A) No insurance policies are deliberately underpriced
      in order to attract customers to the insurance
      company offering such policies.
  (B) A policy that represents a net loss to the insurance
      company is not an underpriced policy in every
      case.
  (C) There are policies for which the level of claims
      per year can be predicted with great accuracy
      before premiums are set.
  (D) The income earned by investing premium income
       is the most important determinant of an
       insurance company’s profits.
  (E) The claims against at least some underpriced pol-
      icies do not require paying out all of the pre-
      mium income from those policies as soon as it
      is earned.

The key is E, why?  Could anyone can kindly give me some advice?  Thanks in advance![em12]

tongxun

又一数学类问题。
保险金可以用来投资获取利润。因此，索赔大于保险金也不代表要赔钱。
前提必须是投资获得至少等于赔出的钱，此论点才能成立。E。

sillybird

感谢！！经你一点拨，感觉题目不是很难哟！可为什莫我就是错！看来我的阅读能力真是太差[em16]

tongxun

主要是还不习惯做这样的题。若你连续碰到2次，肯定会。