Answer:
D. it served as the basis for other legislation.
Step-by-step explanation:
According to All Together Now by Barbara Jordan, she believes that a society can live in harmony by learning to be tolerant of people of different races and cultural background.
When she refers to "the fundamental piece of civil rights legislation in this century," she means that the passing of the Civil Rights legislation was a stepping stone for other legislation to be passed that would give minorities the much needed legal protection they needed.