问题如下：
Which of the following statements about hypothesis testing is correct?
选项：
A. The null hypothesis is the condition a researcher hopes to support.
B. The alternative hypothesis is the proposition considered true without conclusive evidence to the contrary.
C. The alternative hypothesis exhausts all potential parameter values not accounted for by the null hypothesis.
解释：
C is correct.
Together, the null and alternative hypotheses account for all possible values of the parameter. Any possible values of the parameter not covered by the null must be covered by the alternative hypothesis (e.g., H0: θ ≤ 5 versus Ha: θ > 5).
看不懂答案，麻烦老师解释一下