Which American boxer, known as 'The Greatest', won the world heavyweight championship three times and was also a civil rights activist and cultural icon?

• A Joe Frazier
• B Muhammad Ali ✓
• C George Foreman
• D Mike Tyson

Muhammad Ali (born Cassius Clay) transcended sport with his refusal to serve in Vietnam, his conversion to Islam, and his poetic trash-talk that redefined athlete activism.