Within the system of separated powers, the framers provided for supremacy by the:

The correct answer is B. Judiciary.

In the system of separated powers, the framers of the Constitution established the judiciary as the mechanism to interpret laws and ensure that no branch of government exceeds its authority. The judiciary has the power of judicial review, which allows it to invalidate laws or executive actions that are found to be unconstitutional. This serves as a check on the legislature and executive branches, maintaining a balance of power and reinforcing the supremacy of the Constitution.