下述程序执行后，输出结果是( )。
For n = 3 To 1 Step-1
x$ = String$(n, "#")
Print x$
Next n

A．Sub Commandl_Click0
Dim student As Stutype
With student
.ino = 12
. strname = smith
.strsex =
.smark = 89
End With
End Sub
B．Sub Commandl_Click0
Dim student As Stutype
With student
.ino = 12
.strname = "smith"
.strscx = "男"
.smark = 89
End With
End Sub
C．Sub Commandl_Click0
Dim student As Stutype
With Stutype
ino = 12
.strname = "smith"
.strsex = "男"
.smark = 89
End With
End Sub
D．Sub Command1 _Click()
Dim student As Stutype
With student
.ino = 12
.strname = "smith"
.strsex = "男"
.smark = 89
End student
End Sub

A．过程的定义可以嵌套，但过程的调用不能嵌套
B．过程的定义不可以嵌套，但过程的调用可以嵌套
C．过程的定义和调用都可以嵌套
D．过程的定义和调用都不能嵌套