Which court supervises appeals of lower court decisions in Washington State?

The Washington State Supreme Court is the highest court in the state, and it has the authority to supervise appeals of lower court decisions, including those from the Court of Appeals, Superior Courts, and in some instances, directly from lower courts. As the final arbiter on legal disputes within the state, the Supreme Court's rulings set legal precedents that influence future cases and thereby shape the law in Washington.

While the State Court of Appeals also handles appeals from lower courts, it is not the highest court and does not supervise other appellate courts; rather, it operates under the oversight of the Washington State Supreme Court. Municipal and District Courts primarily handle lower-level cases and their decisions can be appealed to higher courts, but they do not supervise appeals themselves. The Supreme Court's role is crucial in interpreting laws and ensuring consistency across the judicial system in Washington, making it the correct answer in this context.