问题如下：
Which of the following descriptions on the p-value is most accurate?
选项：
A. It is a stable value in all hypothesis testings.
B. It's the probability of obtaining a test statistic which leads to a rejection of the alternative hypothesis.
C. It is the smallest significant level for which the hypothesis would be rejected.
解释：
C is correct. The p-value is the probability of obtaining a test statistic that would lead to a rejection of the null hypothsis, and it's the smallest significance level for which the hypothesis would be rejected.
老师，答案a为什么错呢？