What brought an end to the Montgomery bus boycott? The city passed an ordinance integrating public transportation.
The city suspended all bus routes to black neighborhoods.
A federal court declared segregated buses illegal.
The Alabama National Guard protected black bus riders.

the first option

Explanation:

On June 5, 1956, a Montgomery federal court ruled that any law requiring racially segregated seating on buses violated the 14th Amendment to the U.S. Constitution.

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