What generation of americans participated in the counterculture? (2 points the silent generation baby boomers generation x?

The correct answer is the Baby Boomers. This is the generation born after world war 2, so it's the ones who were old enough to be young and rebellious in the 60s when the counterculture movement was the strongest. Generation X was their children, while the silent generation was before them, back in the 20s, so they wouldn't be participating in the counter-cultural reforms.