单选题 在窗体上添加一个命令按钮，名为Command1，并编写事件过程和函数过程，则输出结果为______。
Function f1(x As Integer)As Long
Dim s As Long,i As Integer
s=0
For i=1 To x
s=s+i
Next i
f1=s
End Function
Private Sub Command1_Click()
Dim i As Integer,sum As Long
For i=1 To 5
sum=sum+f1(i)
Next i
Print sum
End Sub

• A.25
• B.35
• C.45
• D.55