The correct answer is - 4. the condemnation of South Africa by the International community.
The apartheid in South Africa was a policy which separated and segregated people in the country by their color of the skin, so in essence it was based on racism. While the white population had the opportunity to participate in everything in the society, the black population was very restricted and not allowed to participate in most of the things in the country.
This led to a reaction by the International community by condemning South Africa, and it was made a huge pressure over the government and the elites in order to stop that policy and give everyone in the country the same opportunities and means for leaving.