How did pollution start become a problem?

The case of brown v. board of education was started when a. oliver brown's daughter had to walk 21 blocks to the nearest school when an all-white school was only 7 blocks away. b. oliver brown's son was caught at a sit-in at the local school district. c. oliver brown's son was unable to participate in the school's all-white football team. d. oliver brown's daughter was unable to attend high school because there were none for her to attend.