The Montgomery Bus Boycott of 1955-56 Persisted Until

The Montgomery bus boycott of 1955-56 persisted until

A) exhausted and demoralized black protestors began riding the buses again.
B) Martin Luther King Jr.called an end to the boycott.
C) the U.S.Supreme Court overturned Alabama's state and local laws requiring segregation on buses.
D) the U.S.Supreme Court upheld Alabama's right to enact any laws it thought appropriate to govern its people.