The federal government pulled out the troops in the south during the Reconstruction, leaving the African Americans unprotected.
Article 1 gives powers and limits to the congress and createthe Senate and House of Representatives; Article 2 refers to the executive branch (President and its officers) and the day to day administration of the Nation; Article 3 creates the judicial branch, with the responsibility of interpreting the Law.
The Harding's campaign promises of a return to "normalcy," supported the adoption of an isolationist policy and a series of measure that would return America to the way it was before the war; this idea appealed to voters who were affected by the tension and fighting during WW I and all the damages it had caused, and to those who wanted to return to the way of life before World War I, adopt an isolationist policy rather than getting involved in international treaties or organizations (such as the League of Nations) and to focus on domestic issues.
The answer you’re looking for is C
Ida Bell Wells-Barnett, more commonly known as Ida B. Wells, was an African-American investigative journalist, educator, and an early leader in the Civil Rights Movement. She was one of the founders of the National Association for the Advancement of Colored People.