How Did Vespasian Transform the Political System

How did Vespasian transform the political system?

A) He turned the political system into a military dictatorship in which leading generals served as his chief advisors.
B) He restored powers to the Senate in an effort to contain the growing authority of the military.
C) He transformed the system into an open and admitted monarchy and expanded his power by increasing the size of the bureaucracy.
D) He expanded the size of the military in order to undermine efforts by the bureaucracy, under Senate control, to seize control over the imperial system.