Identify the Error in the Following Code

Multiple Choice

Identify the error in the following code:
Private Sub btnCalculate_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles btnCalculate.Click
' Declare some variables
Dim sngNumber1 As Single
Dim sngNumber2 As Single
Dim sngSum As Single

' Get the two numbers
SngNumber1 = txtNumber1.Text
SngNumber2 = txtNumber2.Text
' Calculate their sngSum... is the next line working?
SngSum = sngNumber1 + sngNumber2
' Display the result
LblSum.Text = sngSum.ToString
End Sub

A) A local variable is misplaced.
B) A conversion function such as CSng was not used.
C) The variable name sngNumberl was misspelled.
D) The variable sngSum was declared as the wrong data type.