The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
I think the author titled the chapter "Jim Crow and the Detested Number Ten," because that was the number of seats reserved for white people, Just whites. These were the buses in Montgomery, Alabama.
Yes, believe it or not, just white people could seat in the first four rows.
These were the terrible times of the Jim Crow laws in the South. Black people had limited civil rights and had separated facilities from the facilities that white people used.
That is why the civil rights movement had to overcome many difficulties, as we can learn to form the civil rights fight from Reverend Martin Luther King Jr.