问题如下：
Which of the following statements regarding agency ratings is wrong?
选项：
A.Credit ratings will not change over time.
B.Rating agencies are not infalliable, they may make some mistakes.
C.Credit rating changes may lag behind the market's price changes.
解释：
A is correct.
Credit ratings can be very dynamic, the bondholders should not suppose that the issuer’s credit rating will remain the same through the entire holding period. B and C are also the credit rating’s risks.
B选项什么意思？
