The unanimous opinion in Brown v. Board of Education was written by

A. Reverend Oliver Brown.

B. all nine Supreme Court justices.

C. Thurgood Marshall.

D. Earl Warren.

The answer to your question is,

D. Earl Warren

-Mabel <3

The correct answer is B.

Brown v. Board of Education was a landmark decision issued by the US Supreme Court in 1954, which declared segregation to be unconstitutional and overturned the former decision reached in the Plessy v. Ferguson judicial procedure, that allowed segregation under the principle "separate but equal". It was considered a major victory connected to the Civil Rights Movement as it set the path for integration.

It was an unanimous decision reached by the nine justices that constituted the US Supreme Court whose Chief Justice at the time was Earl Warren.