Correct Option: A

Michael Johnson currently holds the world and Olympic records in the 400 m . He formerly held the world and Olympic record in the 200 m, and the world record in the indoor 400 m. He also currently holds the world’s best time at the 300 m. He is the only male athlete in history to win both the 200 meter dash and 400 meter dash events at the same Olympics, a feat he accomplished at the 1996 Summer Olympics in Atlanta. Johnson is also the only man to successfully defend his Olympic title in the 400 m in the 2000 Sydney Olympics.