The correct answer is A. In the Brown v. Board of Education case, as Chief Justice, Earl Warren convinced the other justices to issue a unanimous decision for the sake of national unity.
The ruling was delivered on May 17, 1954, unanimously (9-0) by the Warren Court; and established that "separate educational facilities are inherently unequal". With this, the Supreme Court reversed the existing precedents from Plessy v. Ferguson in 1896. As a result of this ruling, racial segregation came to be considered as a violation of the Equal Protection Clause of the 14th Amendment to the United States Constitution. This ruling opened the way for racial integration and achieving civil rights for African Americans.