Hearing the dog barking fiercely, away__________.   [ ]

A. fleeing the burglar                  

B. was fleeing the burglar  

C. the burglar was fleeing              

D. fled the burglar

在窗体中有一个命令按钮command1，编写事件代码如下：
Private Sub Command1_Click()
Dim s As Integer
s=P(1)+P(2)+P(3)+P(4)
Debug.Print s
End Sub
Public Function P(N As Integer)
Dim Sum As Integer
Sum=0
For i=1 To N
Sum=Sum+1
Next i
P=Sum
End Function
打开窗体运行后，单击命令按钮，输出的结果是

A．15

B．20

C．25

D．35