Answer:
A.
Inside the btn_click function define the procedure level constant as
Dim intTwo As Integer =2
B. Outside all the methods define the class level variable
Dim intClass As Integer =23
And inside the btn_click write
intClass = intClass - 2
C. Create a label and write below code:
lblClass.Text = intClass inside the btn_click.
Explanation:
Please check the answer section.