单项选择题

设有以下函数过程
Private Function Fun(a()As Integer,b As String)AsInteger
End Function
若已有变量声明:
Dim x(5)as Integer,n As Integer,ch As String
则下面正确的过程调用语句是()。

A.x(0)=Fun(x, "ch")
B.n=Fun(n, ch)
C.Call Fun x, "ch"
D.n=Fun(x(5), c