C选项为何不对

问题如下：

When making rational and irrational investment decisions, the efficient market hypothesis requires that:

选项：

only the market is rational.

Neither the market nor the investor is rational.

some investors make rational decisions.

解释：

A is correct.

The efficient market hypothesis and the asset pricing model only require the market to be rational.

Behavioral finance is used to explain some irrational decision making in the market.

考点：Efficient Capital Market And Its Forms

等学完行为金融就会知道人是非理性的，我们很难假设个体是理性的。但是市场反应的是人们的平均表现，因此在有效市场假说中我们只假设市场是有效的。请把这道题当做结论记忆就好。