有如下VB 程序段：

k = 1: start = 1: end = 8: flag = 1

Do While k <= 3

    For i = start To end - flag Step flag

        If a(i) > a(i + flag) Then

            t = a(i): a(i) = a(i + flag): a(i + flag) = t

        End If

    Next i

    end = end – flag : flag = -flag : k = k + 1

    t = start: start = end: end = t

Loop

For i = 1 To 8

    List1.AddItem Str(a(i))

Next i

已知a(1)到a(8)的值是39,18,24,14,2,76,65,59，运行之后a(1)到a(8)的值是（   ）

A、65 39 18 2 14 24 59 76

B、65 18 14 2 24 39 59 76

C、65 18 2 14 24 39 59 76

D、65 18 14 24 2 39 59 76