The correct answer is C. Judo.

Wrestling, karate, and boxing are all combat sports that involve grappling and striking. Pole-vaulting, swimming, and polo are all non-combat sports that involve different skills.

Judo is a Japanese martial art that emphasizes throwing, grappling, and pinning an opponent to the ground. It is a form of self-defense that can also be used as a competitive sport.

Pole-vaulting is an athletic event in which an athlete uses a long pole to jump over a bar. It is a track and field event that is typically held outdoors.

Swimming is a recreational and competitive sport that involves moving through water using one's arms and legs. It is a popular sport that can be enjoyed by people of all ages and abilities.

Polo is a team sport that is played on horseback. It is a fast-paced game that involves hitting a ball with a mallet into the opponent's goal.