The Framers' Most Significant Modification of the Traditional Doctrine of the Separation

The framers' most significant modification of the traditional doctrine of the separation powers was to

A) include federalism.
B) include a two-chamber legislature.
C) define legislative power precisely,while defining executive and judicial power only in general terms.
D) ensure that the powers of the separate branches overlap,so that each could better act as a check on the others.
E) grant the power of judicial review to the judiciary.