Answer;
B) The boycott started a massive nonviolent movement.
Step-by-step explanation;
-The Montgomery Bus Boycott was a civil-rights protest during which African Americans refused to ride city buses in Montgomery, Alabama, to protest segregated seating.
-The mass protest against the bus system of Montgomery, Alabama, by civil rights activists and their supporters that led to a 1956 Supreme Court decision declaring that Montgomery’s segregation laws on buses were unconstitutional.