What will be displayed by the following program when the button is clicked?

```

Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim a As String, n, c As Integer
a = "HIGHBACK"
n = CInt(Int(a.Length / 2))
c = 0
For k As Integer = 0 To n – 1
If a.Substring(k, 1) > a.Substring(7 – k, 1) Then
c += 1
End If
Next
txtBox.Text = CStr(c)
Endcode}
(A) 1
(B) 2
(C) 3
(D) 4
(E) 5

(C) 3