The correct option is C African National Congress
The National Party was a militant section of the South Africa Party which advocated for a twin policy of supremacy of Boers over the British, and whites over the blacks. The Unionist Party was the party formed by the British. African National Congress was a party led by Nelson Mandela, who aimed to fight and overcome the racist policies prevalent in South Africa. The Union of South Africa was the name given to the union of four colonial states unified by the British.