C. A depression in the ground caused by the removal of soil or bedrock.
Civil Rights Movement was caused by the rampant discrimination of the segregation laws that had continued in the USA.
Explanation:
Segreagation laws were an arachaic practice that had continued in the USA even as the world was rapidly decolonizing and becoming increasingly free among its people.
Many countries had already achieved universal suffrage but USA was far behind in this thing from the other countrysides of the world
Thus the leaders felt that there was a need for revolution to bring constitutional equality to USA that it has always talked about in its constitution but never actually practiced in real.
Getting rid of people who opposed, getting rid of the provisional government, and they had to get peasants to start a revolution.
D, anything to do with another country is foreign policy
