Under the Rule of Augustus, the Roman Empire

Under the rule of Augustus, the Roman Empire

A) was a principate, with Augustus acting as an equal co-ruler with the Senate.
B) returned to its traditional republic institutions.
C) turned towards an absolute monarchy, with the princeps overshadowing the Senate.
D) experienced a series of civil wars, making Augustus unpopular among the citizenry.
E) became an oligarchy, with political power increasingly concentrate in the hands of the Senate.