Trying to create a fun quiz for the lockdown

So I’m getting somewhere with this. I have set up a multi page form, which multiple choice questions using radio buttons.

But what I’m not sure about is ho to add the ‘scoring’ to the questions.
For example:

Q1: How tall is Andy?
[A ] 185cm
[B] 195cm
[C] 205cm

The answer is B, but how do I translate that to a score of 1, and all others get a score of zero?
Finally I need a way to add them all up in a hidden field at the end to give them a score.

Can anyone help?

Thanks!
Andy