下面If语句统计满足性别(sex)男、职称(duty)为副教授或教授、年龄(age)小于40岁条件的人数，正确的语句是 。（A）If sex= "男" And age < 40 And InStr(duty,"教授") > 0 Then n = n + 1（B）If sex= "男" And age < 40 And duty= "教授"or duty= "副教授" Then n = n + 1（C）If sex= "男" And age < 40 And Right(duty,2) = "教授" Then n = n + 1（D）If sex= "男" And age < 40 And duty = "教授" And duty = "副教授"Then n = n + 1
选项：

A:A
B:B
C:C
D:D