Hello! I can help you with this! Here are the numbers that the letters go with and the explanations for it.
A-3: Apartheid was a system of racism in Africa with whites getting the most power over the blacks, even though they were the minority in the country.
B-4: Genocide is when there are people that they to completely eliminate another group. The Holocaust was a genocide where they tried to completely wipe out the Jewish people.
C-2: Polarized has several different definitions, but one of them is to break up into opposing groups. For example, an election may separate a country by being divided with opinions or a war may separate people on whether they want to keep fighting or leave the war.
D-1: Homogeneous is having the same or similar nature, because the prefix "homo" means same and the suffix "geneous" has something to do with having some type of nature. Those two together make the definition of having the same or similar nature.
