Hi, Gokulanathan,
Thank you for sharing the .story file!
My suggestion is to only change the values of N1, N2, and N3 when the user clicks the submit button, which will avoid letting the user change the response after those values have been set.
I also noticed that you don't have a trigger to account for an answer other than "Adidas", "Nike", or "Puma". Since the initial value of N1, N2 and N3 is 0, as long as two answers match the options above (therefore, the value is no longer 0), you will receive the correct feedback.
Let me know if this works!