The answer is B, communism. This is easy to remember because Europe colonized Africa, and basically enslaved the native peoples. Europe is never associated with communism, so it would not make sense for them to be fighting it.
The antiwar protests at Kent State took place on May 4, 1970. The students were protesting the Vietnam War. During the protests, the Ohio National Guard opened fire on the protestors and killed four students. Nine other students were injured. After the incident, a student-led strike closed many college campuses across the country.
