The correct answer is swimming.
This is because it is the only individual sport among these options. All of the rest require a team to participate in. For example basket ball needs a team of 5 people at least. But in case of swimming you can race alone against all the other people.
Swimming is the self-propulsion of a person through fresh or salt water, usually for recreation, sport, exercise, or survival. It is one of the greatest sport in order to remain physically fit.
