The correct response to how the Plessy v. Ferguson decision legally interpreted the Constitution prior to the civil rights movement is:
The decision used strict constructionism by refraining from attempting to decipher the intent behind the Fourteenth Amendment.
This is because the ruling focused on a literal interpretation of the Fourteenth Amendment, supporting the legality of segregated facilities without delving into the broader intentions of its authors regarding racial equality. This strict approach allowed for the continuation of state-sanctioned racial segregation, which was justified under the notion of maintaining separate but equal facilities.