问题如下：
Company A released its annual report to the public recently and its share price reacts gradually to it. With respect to efficient markets, which of the following statements about the market is correct?
选项：
A. The market is subject to behavioral biases.
B. The market is semi-strong-form efficient.
C. The market received additional information about the company.
解释：
C is correct.
The information from the annual report is already reflected in the stock prices if the markets are efficient. So the gradual changes of the stock prices are not to the releasing of annual report but to additional information.
老师，b为什么不对呢？
