Youth Culture of the 1960s Practice Test

A historian observes that some late-1960s youth activists became disillusioned with nonviolent protest and turned toward more militant rhetoric and tactics. Which group best represents this more radical turn within the student movement?

A 1988 secondary source argues that youth protest contributed to changes in the legal status of young Americans by strengthening arguments that those old enough to be drafted should be able to vote. Which constitutional change best reflects this consequence of the Vietnam-era youth movement?