( )10. 執行下列 Visual Basic 程式，輸出結果為何?
(A) 20
(B) 39
(C) 15
(D) 10

```vba
Sub Main( )
Dim K As Integer
K = GAME(5)
Console.WriteLine(K)
End Sub
Function GAME(ByVal X As Integer) As Integer
If (X > 3) Then
GAME = X + GAME(X - 1) + GAME(X - 2) + GAME(X - 3)
Else
GAME = X
End If
End Function
```

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