I believe the answer is c but I’m not 100% sure
It will change the way we do normal things such as going to certain stores, have arrows showing what lane you can go down, not being able to leave the country for awhile, and social interaction
Barriers to physical fitness and activity may be someone's health (they may have a disease that prevents them from exercising). Other than this, there really is no limit to whom can exercise.
Hope this helps!