Option D, He sat down in a trains whites- only car, is the correct answer.
Explanation:
Plessy v. Ferguson was a breakthrough resolution of the United States' Supreme Court held in 1896. It sustained the legality of ethnic segregation law for public services as far as the segregated facilities were comparable, this very concept came to be recognized as "separate but equal".
This case emerged from an incident in 1892 in which Homer Plessy an African-American railway passenger refused to sit in a car reserved for blacks.
