Question

how did marshall show the negative effect of segregation in his famous case brown v. board of education? he privately convinced the opposing lawyer, john w. davis, to concede marshalls argument. he brought in a psychologist who showed that segregation had a negative effect on the \hearts and minds\ of children. he organized the naacp to write petitions. he invited dr. martin luther king, jr., to speak in court.

Explanation:

In the Brown v. Board of Education case, Thurgood Marshall and the NAACP used social science evidence, specifically the research of psychologists (including the Clark doll experiment) that demonstrated segregation inflicted psychological harm on Black children, damaging their self-esteem and mental well-being. The other options are incorrect: Marshall did not convince the opposing lawyer to concede, the NAACP's work extended beyond just petitions for this case, and Dr. Martin Luther King Jr. did not testify in this specific trial.

Answer:

B. He brought in a psychologist who showed that segregation had a negative effect on the "hearts and minds" of children.