The teacher said we needed to choose three _____ for the school concert. [ ]

A. farmers

B. doctors

C. drivers

D. singers

阅读程序：
Option Base 1
Private Sub Form_Click()
　　Dim art,Sum
　　Sum=0
　　art=Array(1,3,5,7,9,11,13,15,17,19)
　　For i=1 To 10
　　If arr(i)/3=arr(i)\3 Then
　　Sum=Sum+art(i)
　　End If
　　Next i
　　Pdnt Sum
End Sub
程序运行后，单击窗体，输出结果为( )。

A．13

B．14

C．27

D．15