Answer:
He thought they weakened the power of the United States Congress.
OPTION A: They held the first national protest against the war in Vietnam.
Students for a Democratic Society (1960-74) was a student activist organization of the U.S., initially engaged in civil rights movement. It was responsible for organizing the first national protest against the war in Vietnam on Washington, D.C., in April 1965. Since then, the SDS grew more militant especially about issues relating to the war.
B. leave mainstream society
I think
