When a leader does such things they are trying to make the people proud of their nation. This is what Nationalism is.
Nationalism refers to the promotion of a nation's ideals to ensure that citizens are proud and loyal to their country. Nationalism is not a bad thing but can lead to ultra nationalism when people actively put others down for the interest of their nations. The leader in the above is instigating a very dangerous type of Nationalism by suggesting that the people are Superior to others but it is Nationalism regardless.
Blacks lived in the Bantustan territory, so it’s not B. Also, apartheid is the segregation and discrimination of blacks. So, choices A and C don’t make sense either.
Columbus was a fool and had much difficulty trying to venture across the world. He was convinced the earth was smaller than it was even though the ancient romans had already figured out the math of the size of the earth.