Select OPTIONS : how set points/score for each options ? (webform module)

Hi,

I have webforms with multiple select options (radio).
And in my select, I want to say option 1 : gives 2 points, option 2 : give 1 point, etc... For after display on a webpage : your score is 12/20 points.

example :

A bear can be ... ?

• 0|White <- response give 2 points
• 1|Yellow <- response give 0 point
• 2|Brown <- response give 2 points
• 3|Dark <- response give 1 points

The question is : what's the best way to store the point of select options ?
In fact : how to add infos each select option row.

Thanks for your recommendations :)