What were the United Nations Sanctions put on South Africa in 1977 (why were there in sanctions put on South Africa in 1977)5-7 sentences please explain the best you can please

Answer which of the following was a major outcome of european imperialism in africa after the industrial revolution? o a. the area around the suez canal experienced decades of military conflict. b. africans in the belgian congo suffered forced labor and oppression. o c. the discovery of rich natural resources led to african economic prosperity. o d. europeans brought disease to central africa, killing thousands.