单项选择题

A. 大写字母Z的序号为90,小写字母z的序号为122
B. 小写字母a的序号为97,大写字母A的序号为65
C. 大写字母Z的序号为90,比小写字母z的序号小32
D. 大写字母Z的序号为90,比小写字母z的序号大32