What Is Displayed When the Button Is Clicked On? Private $a , b$

What is displayed when the button is clicked on? Private Sab btnDisplay_Click(...) Handles btnDisplay.Click
Dim $a , b$ as String
Dim $\mathbf { x }$ as Integer
$\mathrm { a } =$ "How now brown cow."
b = "brown"
$\mathbf { x } =$ FindIt $( \mathbf { a } , \mathbf { b } )$
txtBox. Text $= \operatorname { cStr } ( x )$
End Sub
Function FindIt(z1 as String, z2 as String) As Integer
Dim $\mathbf { x }$ as Integer
$\mathbf { x } = \mathrm { z } 1$ .IndexOf (z2)
End Function

A) "How now"
B) 8
C) 0
D) An error
E) None of the above