Final answer:
Rosa Parks' act of civil disobedience by refusing to give up her seat on a Montgomery bus was a pivotal moment in the civil rights movement.
Step-by-step explanation:
Rosa Parks' act of civil disobedience by refusing to give up her seat on a Montgomery bus was indeed a pivotal moment in the civil rights movement. It sparked the Montgomery bus boycott, a year-long protest that showcased the power of unity and organized nonviolent resistance. The boycott also brought national attention to the leadership of figures like Jo Ann Robinson, E.D. Nixon, and Martin Luther King Jr. and highlighted the role of community activism in achieving change.