On Which Principle Did Corwin, Rossiter, and Schlesinger All Agree

On which principle did Corwin, Rossiter, and Schlesinger all agree?

A) The amount of power gained by a president during war depends on that conflict's severity, and thus over time the checks-and-balances system has been sustained.
B) Each successive war has added to an ever-growing pool of presidential powers that has effectively ended checks and balances.
C) Wars have catapulted presidents to the top of the federal government and out of the supposed three-way tie inherent in our system of checks and balances.
D) Every president has used powers gained from war to manipulate domestic policies and has effectively acted as a constitutional dictator.