Reread this passage from a National Archives blog post about the Montgomery Bus Boycott. Instead of buses, African Americans took taxis driven by black drivers who had lowered their fares in support of the boycott, walked, cycled, drove private cars, and even rode mules or drove in horse-drawn carriages to get around. African-American citizens made up a full three-quarters of regular bus riders, causing the boycott to have a strong economic impact on the public transportation system and on the city of Montgomery as a whole.

What more specific research question is suggested by this passage?

A.) What role did Dr. Martin Luther King, Jr. play in the Montgomery bus boycott?
B.) What impact did the Montgomery Bus Boycott have on the Civil Rights Movement?
C.) How much money did the city of Montgomery lose during the boycott?
D.) What events led civil rights leaders to end the Montgomery Bus Boycott?