One Way by Which the Romans Were Able to Maintain

Multiple Choice

One way by which the Romans were able to maintain their empire was through:

A) the construction of temples to the goddess Roma throughout the empire.
B) a graduated system of taxation that had the support of the poor in the empire.
C) the hiring of mercenary armies from Pythia to defend the northern frontier.
D) a system of army camps that served to enlist and train locals into the Roman army.
E) a system of roads constructed to be able to move army units throughout the empire.