数组a为一组已按降序排序的正整数，依据对分查找思想：设计一个在数组a中查找数据Key的程序。实现该功能的VB程序段如下：

Dim a(1 To 6) As Integer

Const n = 6

a(1) = 98: a(2) = 96: a(3) = 95

a(4) = 90: a(5) = 87: a(6) = 81

i = 1: j = n

Key = Val(Text1.Text)

f = False

Do While  And f = False

    m = (i + j) \ 2

    If a(m) = Key Then

        Text1.Text = "已找到": f = True

    ElseIf a(m) > Key Then

       

    Else

       

    End If

Loop

上述程序中方框处语句依次为（    ）

A、i <= j   i = m + 1      j = m - 1

B、i <= j     j = m - 1       i = m + 1

C、i < j            j = m - 1       i = m + 1

D、i < j            i = m + 1      j = m - 1