Communists were associated with the color red because of the red flag of the Soviet Union -- thus the "Red Scare." One manifestation of the Red Scare was how people's privacy was invaded. Accusations about communists and communist sympathizers were aimed at all sorts of people. Many people in the Hollywood film industry were targeted during that time, for instance. But defenders of freedom (including film and television people) fought back against that. Those who aimed to protect the rights and liberties of each individual saw the Red Scare tactics as "witch hunts," where we suspect our neighbors of evil for no good reason.
Speaking of "witch hunts," the playwright Arthur Miller wrote a really powerful play in 1953, during the Cold War, which focused on the Salem witch trials. He was making the point that what was happening in the Red Scare (hunting for communists) was another manifestation of the witch-burning craze that had happened at a previous time in history.
Red Scare was the name given to the widespread fear of suspected Communists and radicals in the United States after World War I. The correct option among all the options given in the question is option "A". The first Red Scare happened in the United States during the 20th century and the reason was hyper nationalism in respect to World War I.
The Civil Rights Act of 1871 is a United States federal law that prohibits ethnic violence against blacks. The Act was passed to protect southern blacks from the Ku Klux Klan by providing a civil remedy for abuses then being committed in the South.
General Cornwallis was (obviously) a general, and that was his main job. As he served in the war/army, he fought as a captain of a league of soildiers and tried to beat another team.