The correct answer is B. swimming.
A butterfly stroke is a swimming stroke swum on the chest, with both arms moving symmetrically, accompanied by a flutter kick. It is the fastest of the four competitive swimming strokes.
The other options are incorrect because they are not associated with the butterfly stroke. Kabaddi is a contact team sport played between two teams of seven players each, where one player from the attacking team tries to tag as many members of the opposing team as possible without being tackled by them, while the other team tries to prevent this from happening. Swimming is a recreational activity, a competitive sport, or a means of transportation. Boxing is a combat sport in which two people, usually wearing protective gloves, throw punches at each other for a predetermined number of rounds. Wrestling is a combat sport that involves grappling with an opponent and attempting to pin them to the ground.