Okay. A and C are definitely true, because was in prison 27 years and he was the president of South Africa. B is actually true, because he was a leader of the ANC. You can search up the leaders for group and you'll se his name. There was a time in South Africa called apartheid and whites had full power, despite being the minority. Mandela did not like how black people were being treated poorly over them. The answer for this question is D.
