What single event provided the opportunity for black leaders in Montgomery Alabama to try and investigate the city's bus system?

The single event that provided the opportunity for black leaders in Montgomery, Alabama, to investigate the city's bus system was the arrest of Rosa Parks on December 1, 1955. Parks' refusal to give up her seat to a white passenger sparked outrage and mobilized the African American community, leading to the Montgomery Bus Boycott. This boycott, organized by local leaders including Martin Luther King Jr., aimed to challenge the discriminatory practices of the bus system and ultimately brought national attention to the Civil Rights Movement.