Final answer:
The protesters in Selma regrouped after Bloody Sunday, and with federal protection provided by President Johnson, successfully marched from Selma to Montgomery from March 21 to 25, 1965, drawing national support and contributing to the passage of the Voting Rights Act. Hence, the correct answer is option (A).
Step-by-step explanation:
After the Bloody Sunday march was beaten back by Alabama State Troopers on March 7, 1965, the protesters did not give up. They regrouped and, backed by public outcry and support from President Lyndon B. Johnson, planned another march. Despite initial concerns about further violence and a temporary court order that delayed second attempts, the protesters pressed on.
Under the protection of federal forces sent by President Johnson, the march from Selma to Montgomery resumed on March 21, 1965, and concluded successfully on March 25. Approximately 25,000 demonstrators joined the march by the time it reached Montgomery, including thousands who had traveled from across the country to stand in solidarity. The marchers were not stopped again by violent mobs on this occasion, making option A the correct answer to the question.