Final answer:
The March on Washington for Jobs and Freedom led to the passage of civil rights legislation by President Lyndon Johnson, further amplifying the civil rights movement's goals.
Step-by-step explanation:
The outcome of the March on Washington for Jobs and Freedom in 1963 was not the decreased importance of Martin Luther King Jr., the arrest of protesters, or a Supreme Court ruling. Instead, one of the most significant outcomes was the eventual passage of a civil rights law by President Lyndon Johnson. This march is best remembered for Martin Luther King Jr.'s "I Have a Dream" speech, which encapsulated the goals of the civil rights movement and strengthened the call for civil rights legislation.