问题如下：
The Basel Committee has established four categories of causes for exceptions. Which of the following does not apply to one of those categories?
选项：
A.Small sample.
B.Intraday trading activity.
C.Model accuracy needs improvement.
D.The basic integrity of the model is lacking.
解释：
Causes include the following: bad luck, intraday trading activity, model accuracy needs improvement, and the basic integrity of the model is lacking.
intraday trading activity是指的日内交易，不过这个日内交易和这个模型是否靠合格有啥关系啊？
