有如下 VB 程序段：

a(1) = 23: a(2) = 32: a(3) = 46: a(4) = 38: a(5) = 15: a(6) = 55: a(7) = 39

For i = 1 To 5

  For j = 2 To 7-i

    If a(j) > a(j + 1) Then

      t = a(j): a(j) = a(j + 1): a(j + 1) = t
      c = c + 1

    End If

  Next j

Next i

c 的初值是0，程序执行完后，c的值是（     ）

A、8

B、7

C、6

D、5