Which is the most relevant statement to include in an essay comparing different kinds of governments?

A As of 2017, about 57 percent of large countries were democracies, and 13 percent were dictatorships.
B In the 1800s, socialist leaders called for better conditions and equal incomes for working people.
C Karl Marx wrote that each person should work for a living and be paid according to their needs.
D Adolf Hitler was a dictator who rose to power in Germany during the Great Depression.