The most significant accomplishment of the montgomery boycott was that it led to

The correct answer is The elevation of of Martin Luther King, Jr., to prominence as a civil rights leader

After the boycott, Martin Luther King Jr. became the leader of the civil rights act and his face got recognition as the face of peace and equality. It is because he became the leader that he had the possibility to organize new protests and boycotts and to hold speeches that were televised everywhere like the famous i have a dream speech.