When the odd numbers are added successively, any finite sum will be a perfect square (e.g., 1 + 3 + 5 = 9 and 9 = 3^2). What change must be made in the following program to correctly demonstrate this fact for the first few odd numbers?

Question

```
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim oddNumber As Integer
Dim sum As Integer = 0
For i As Integer = 1 To 9 Step 2 'Generate first few odd numbers
oddNumber = i
For j As Integer = 1 To oddNumber Step 2 'Add odd numbers
sum += j
Next
lstBox.Items.Add(sum & " is a perfect square")
Next
End Sub
```
(A) Change the Step size to 1 in the first For statement.
(B) Move oddNumber = i inside the second For loop.
(C) Reset sum to zero immediately before the second Next statement.
(D) Reset sum to zero immediately before the first Next statement.

Answer 1

(C) Reset sum to zero immediately before the second Next statement.