运行下列程序:Private Sub Form_Click()Dim sum As IntegerDim i As Integersum = 0For i =12

运行下列程序：

Private Sub Form_Click()

Dim sum As Integer

Dim i As Integer

sum = 0

For i =12.4 To3.1 Step -3.8

sum = sum + i

Next i

Debug.Print sum

End Sub

单击窗体后，则在立即窗口上输出结果是()。

A.15

B.- 0.7

C.24

D.0