单项选择题

有如下程序:Private Sub Form_Click()  Dim i As Integer,n As Integer  For i=1 To 20    i=i+4    n=n+i    If i>10 Then Exit For  Next  Print nEnd Sub程序运行后,单击窗体,则输出结果是______。

A.14
B.15
C.29
D.30