I too think it's D, but I can't be sure. I read the story as well and D is the best answer for your question.
<span>This was the Alliance of Colored Farmers of Texas. This was the forerunner to the larger Colored Farmers' Alliance groups. In addition, this was in response to the color bar set against black farmers by the Southern Farmers' Alliance groups, many of whose members felt that the former slaves were better off being in bondage.</span>
It was mainly "a. Genghis Khan" who <span>united and expanded the Mongol Empire, due mostly to his superior military skills, which allowed the Mongols to conquer vast areas of land. </span>
All of the mentioned people are a part of ancient Greece
Leonidas- He was the king of Sparta, a city located in ancient Greece
Philip of Macedon- He was the king of Macedon (ancient Greece) who has its origin from the Argead dynasty
Alexander the Great- Also known as Alexander III he is a popular king known for his conquests around the world.
Cleisthenes- He is a Greek lawmaker who is known for creating the constitution of ancient Greece
Solon- A Greek lawmaker who is known for laying the foundation stone for Greek democracy
Demosthenes- An orator from ancient Greece. He is also known for his statesmanship