Final answer:
The protestors were planning to march from Selma to Montgomery, which is about 50 miles away, to address grievances over the murder of Jimmy Lee Jackson. This event was a significant part of the Civil Rights Movement leading to the Voting Rights Act of 1965. The correct option is A.
Step-by-step explanation:
The protestors were planning to march from Selma to the important Alabama city of Montgomery. The march was 50 miles long and it was undertaken to present a list of grievances regarding the murder of Jimmy Lee Jackson. This march, known as the Selma to Montgomery march, was a pivotal moment in the Civil Rights Movement.
It highlighted racial injustice in the south and contributed to the passage of the Voting Rights Act of 1965. The march began on March 7, 1965, led by figures such as John Lewis, and faced violent opposition on what became known as 'Bloody Sunday.'
The march resumed later with federal protection and concluded with a large rally in Montgomery, where Dr. Martin Luther King Jr. delivered a powerful speech calling for a stop to racial discrimination. The correct option is A.