单击命令按钮执行下列程序，其输出结果是()。 Private Sub Command1_Click() Dim a As Integer, b As Integer, c As Integer a=3 b=4 c=5 Print SecProc(c,b,A)End Sub 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

A. 20
B. 22
C. 28
D. 30