Final answer:
Rosa Parks was known for her role in the Montgomery Bus Boycott, which began after she refused to give up her seat on a bus to a white man.
Step-by-step explanation:
Rosa Parks was known for her role in the Montgomery Bus Boycott, which began on December 5, 1955, after she refused to give up her seat on a bus to a white man. Her arrest and participation in the boycott brought widespread attention to the civil rights movement and helped to spark further actions for desegregation and equal rights.