Answer:
The answer is D. The Montgomery bus boycott was one major achievement of the civil rights movement during the 1940s and 1950s.
Step-by-step explanation:
The Montgomery buss boycott was a political and social protest against segregation in public transport in Alabama. It began with the very known act of protest made by Rosa Parks; the boycott lasted time enough for there to be severe economic consequences to the public transport system. It is considered a major achievement for civil rights because it culminated with the laws that aproved segregation in public transport being ruled unconstitutional.