Every kid is different, so there is no one ‘correct’ answer. Many kids applying to colleges have more interests and activities than fit on the CA form. And even for those that have so few that they do fit on the CA form, it’s a good idea to pick and choose what they show the school, even down to putting them in order of importance.
This could be the type activity that’s important enough it’s the top thing listed on this kid’s app or it could just be one of dozens of things this kid does and not be important enough to be listed.