What type of activity involves people "shooting" each other with paintballs?

The correct choice is paintball, which is a team-based sport where individuals use air-powered markers to shoot capsules filled with paint at opponents. Participants wear protective gear to prevent injury and aim to eliminate players by marking them with paint, signaling a hit. This activity often takes place in various outdoor or indoor arenas that mimic natural or urban environments, adding to the competitive nature of the game.

In contrast, airsoft involves the use of replica firearms that shoot plastic pellets, while laser tag utilizes infrared technology for tagging opponents without any physical projectiles. Capture the flag is a tactical game that combines elements of strategy and teamwork but does not involve shooting; instead, players aim to retrieve a flag from the opposing team's territory. These distinctions clarify why paintball is the most accurate description of the activity involving people "shooting" each other with paintballs.