The 1970 U.S. invasion of Cambodia caused protests across the country. At Kent State University in Ohio, _____.

students took over the administration building

faculty members protested President Johnson's policies

antiwar demonstrators clashed with pro-war faculty members

students were killed when National Guardsmen fired on a crowd of demonstrators

Verified Answer :

At Kent State University in Ohio, "students were killed when National Guardsmen fired on a crowd of demonstrators," since this was widely viewed as the "face" of the protest movement. 

National Guardsmen killed four students.