请问a选项哪里错了？
问题如下图：
选项：
A. 
B. 
C. 
解释：
NO.PZ2017092702000124 问题如下 Whiof the following statements regarng a one-tailehypothesis test is correct? A.The rejection region increases in size the level of significanbecomes smaller. B.A one-tailetest more strongly reflects the beliefs of the researcher tha two tailetest. C.The absolute value of the rejection point is larger ththof a two-tailetest the same level of significance. B is correct. One-tailetests in whithe alternative is \"greater than\" or \"less than\" represent the beliefs of the researcher more firmly tha \"not equto\" alternative hypothesis一个双尾检验是例如均值是否等于0，此时检验结果无论是远大于0还是远小于0都可以拒绝原假设。并没有一个明确的方向。而一个单尾检验有确定的方向，例如检验均值是否大于0。此时只有均值远小于0才可以拒绝原假设。所以单尾的检验更有针对性，反应出来检验者对于检验的方向和信心更强。 A为什么是错的呢？
NO.PZ2017092702000124 问题如下 Whiof the following statements regarng a one-tailehypothesis test is correct? A.The rejection region increases in size the level of significanbecomes smaller. B.A one-tailetest more strongly reflects the beliefs of the researcher tha two tailetest. C.The absolute value of the rejection point is larger ththof a two-tailetest the same level of significance. B is correct. One-tailetests in whithe alternative is \"greater than\" or \"less than\" represent the beliefs of the researcher more firmly tha \"not equto\" alternative hypothesis一个双尾检验是例如均值是否等于0，此时检验结果无论是远大于0还是远小于0都可以拒绝原假设。并没有一个明确的方向。而一个单尾检验有确定的方向，例如检验均值是否大于0。此时只有均值远小于0才可以拒绝原假设。所以单尾的检验更有针对性，反应出来检验者对于检验的方向和信心更强。 老师能不能一下A是什么意思
NO.PZ2017092702000124 问题如下 Whiof the following statements regarng a one-tailehypothesis test is correct? A.The rejection region increases in size the level of significanbecomes smaller. B.A one-tailetest more strongly reflects the beliefs of the researcher tha two tailetest. C.The absolute value of the rejection point is larger ththof a two-tailetest the same level of significance. B is correct. One-tailetests in whithe alternative is \"greater than\" or \"less than\" represent the beliefs of the researcher more firmly tha \"not equto\" alternative hypothesis一个双尾检验是例如均值是否等于0，此时检验结果无论是远大于0还是远小于0都可以拒绝原假设。并没有一个明确的方向。而一个单尾检验有确定的方向，例如检验均值是否大于0。此时只有均值远小于0才可以拒绝原假设。所以单尾的检验更有针对性，反应出来检验者对于检验的方向和信心更强。 我觉得应该是当level of significan变小，比方说从5%到1%，那rejection region 的size是变小的啊
NO.PZ2017092702000124 A one-tailetest more strongly reflects the beliefs of the researcher tha two tailetest. The absolute value of the rejection point is larger ththof a two-tailetest the same level of significance. B is correct. One-tailetests in whithe alternative is \"greater than\" or \"less than\" represent the beliefs of the researcher more firmly tha \"not equto\" alternative hypothesis 一个双尾检验是例如均值是否等于0，此时检验结果无论是远大于0还是远小于0都可以拒绝原假设。并没有一个明确的方向。 而一个单尾检验有确定的方向，例如检验均值是否大于0。此时只有均值远小于0才可以拒绝原假设。 所以单尾的检验更有针对性，反应出来检验者对于检验的方向和信心更强。 请问老师可以说一下a 吗？
NO.PZ2017092702000124 老师能不能详细一下b和c 谢谢！
