What will be the output of the following program when the button is clicked on?
```
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim number As Double = 3
DoubleAndSquare(number)
txtBox.Text = CStr(number)
End Sub
Sub DoubleAndSquare(ByRef myVar As Double)
myVar = myVar + myVar
myVar = myVar * myVar
End Sub
```
(A) block scope
(B) procedure scope
(C) class scope
(D) None of the above
(B) procedure scope
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