The correct answer is D) a significant civil rights event occurred during each of the first five years of the sixties.
A valid generalization based on the information is that a significant civil rights event occurred during each of the first five years of the sixties.
For instance, in February 1, 1960, there were non-violent protests in Greensboro, North Carolina because a store did not want to serve four black students. On February 21, 1965, Malcolm X was assassinated. On April 4, 1968, Martin Luther King was shot in Memphis, Tennessee. And on April 21, 1961, the court ordered integrated busing plans to be implemented in Denver and Boston.
