患者，女性，36岁：因“胆囊炎，胆石症”明天即将做胆囊切除术，护士应首选下列哪个主题与患者交谈（）。

A.术前应保证充足的睡眠

B.规律饮食的重要性

C.术前需要做的准备

D.鼓励患者战胜疾病

E.预防术后并发症

Which of the following statements regarding confidence intervals is TRUE（）

A. The higher the alpha level, the wider the confidence interval.

B. The relationship between the alpha level and the confidence interval cannot be ascertained.

C. The lower the alpha level, the wider the confidence interval.