Answer :
Thurgood marshall made other important contributions to policies related to prejudice, including arguing the case of Brown v. Board of Education. Thus, option (d) is correct.
Who is Marshall?
The term Marshall refers to those born on July 26, 1842, and who passed away on July 13, 1924. He was an English economist. He was researching the two theories such as integration theory and general theory.
Marshall made significant contributions to anti-prejudice policies, notably litigating the case of Brown v. Board of Education. That basically indicates that racial segregation in public schools is unlawful.
As a result, Marshall contribution to arguing the case of Brown v. Board of Education. Therefore, option (d) is correct.
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Your question is incomplete, but most probably the full question was.
a. proposing affirmative action policies.
b. the Emancipation Proclamation.
c. developing the Civil Rights Act.
d. arguing the case of Brown v. Board of Education