单项选择题

单击命令按钮时,下列程序代码的执行结果为 ( )
Function FirProc(x As Integer, y As Integer, z As Integer)
FirProc=2*x+y+3*z
End Function
Function SecProc(x As Integer, y As Integer, z As Integer)
SecProc=FirProc(z, x, y)+x
End Function
Private Sub Commandl Click()
Dim a As Integer, b As Integer, c As Integer
a=2 :b=3 :c=4
Print SecProc(c, b,

A.
End SubA) 21
B.19
C.17
D.34