The organization of campaigns in south africa against the policy of racial separation and segregation are most closely associated with
1) jomo kenyatta
2) cecil rhodes
3) nelson mandela
4) kwame nkrumah

3) Nelson Mandela.

Explanation:

Nelson Mandela was a South African activist and political leader who fought all of his life against Apartheid (the institutionalized form of racial segregation that privileged whites only) and its consequences. For his activism, he was imprisoned for 27 years. In 1990 he was released and in 1994 he won the presidential elections and formed a government that formally ended —even if the consequences are still felt today— the apartheid in South Africa, inspiring many other social movements around the world.