Read this paragraph from an article about the movement that promoted equal rights for Americans with disabilities.

The movement spurred changes in public mental health services and opportunities at the local, state, and national level over the next few decades. . . . Fueled by the successes of the Civil Rights and Women’s Rights Movements, the momentum continued in the 1970s when disabled Americans began to speak for themselves.

What concept or idea is most strongly suggested by the language in this excerpt?

the value of individuals

the passage of time

the hope inspired by progress

the power of government