The best answer is B. Both led to the passage of significant legislation, such as the Civil Rights Act and the Voting Rights Act.
The Selma to Montgomery March in 1965 was pivotal in raising awareness for voting rights, leading to the Voting Rights Act of 1965. The events surrounding the 1968 Democratic National Convention, including protests and demonstrations, highlighted social issues and contributed to the political climate that eventually supported significant legislative changes, although the connection to the Civil Rights Act is less direct. However, the final outcome in both cases did contribute to advancing civil rights and addressing social justice through legislation.