Apartheid policy left a society which labor force was heavily unskilled as education and training opportunities were skewed in favor of the white people. Africans were heavily biased against in training and job opportunities,s such that when apartheid regime ceded power, Africans continue to find themselves living in difficult living conditions, and providing manual labor mainly in mines.
"The OPEC oil embargo" was the reason of the oil crisis during the 1970s among the choices given in the question. The correct option among all the options that are given in the question is the third option or option "C". I hope the answer has actually come to your desired help.