Why was homer plessy arrested?
he said his rights had been violated.
he was clearly of mixed heritage.
he refused to give his seat to a white person.
he sat down in a train’s whites-only car.

The correct answer is "He sat down in a train's whites-only car." Homer Pless had the European and African descent. He was arrested for sitting down on a train that is only for white people. He was convicted because he violates the racial segregation law in the state of Louisiana.