Nations around the world put pressure on south africa to end apartheid. what type of pressure was most effective? a. encouraging civil war b. rejecting south african immigrants c. promising financial aid to black communities throughout south africa d. banning south african participation in international sports competitions

I would say that D would be the most important measure taken against Apartheid and be the most effective of the selection. Personally, I had occasion to do something similar or to play a part in it. When Pinochet was in power in Chile, our Canadian Abbotsford Air Show invited some Chilean pilots to come to perform at the Air Show. I initiated opposition to this with a letter to the editor and in the end they were not permitted to come ie as opposition to Pinochet's fascist government.

The name may be in importnce  to them