Muhammad Ali, also known as Cassius Clay before he converted to the Muslim religion, was a professional Boxer. He became an American heavyweight champion boxer, and it is also considered by almost all sports writers around the world as the greatest sport figure of the 20th century.
Muhammad Ali´s boxing career expanded for 21 years, and was the first boxer to win the heavyweight title in three different occasions. Also, he participated in the Olympic games and won a gold medal for the United states. Muhammad Ali became famous because he was a sport hero an a civil rights spokesman. A will be the correct answer.
Because of his outspokenness in political issues as well well as race and religion, he became a very controversial individual, and peopled loved him for that.
His heavyweight championship was taken away from him in 1964, when he refused to go to military service because of his religious beliefs. Also, he was banned from boxing competitions for 3 years.
