有一组数据23、12、56、34、10分别存放在一组变量数组a(1)―a(5)中，一下程序执行后，i的值是（   ）
Dim a(1 To 5) As Integer
Dim f As Boolean
a(1) =" 23:" a(2) =" 12:" a(3) =" 56:" a(4) =" 34:" a(5) = 10
i =" 1:" f = True
Do While i <=" 5" And f = True
If a(i) =" 56" Then f = False
i =" i" + 1
Loop
Label1.Caption = i

A．6

B．3

C．4

D．5