The correct answer is A. overthrow the Communist leadership
The government at the time was Communist (Marxist-Leninist), so C can't be right. Also the white settlers were already driven out in the war that ended the previous year.
It was the British Empire who won control of South Africa in the Boer Wars, since this ushered in a new period of colonial rule that would last throughout the 20th century in South Africa.
I would say, D. repeat the demands.
