During the Age of the Barracks Emperors

During the age of the Barracks Emperors,

A) Rome experienced a last, brief period of peace.
B) Rome maintained the existence of the ordinary people through agriculture.
C) barbarians from the east entered the Roman Empire for the first time.
D) the Roman military was able to repel all invasions due to its cohesiveness.
E) long-distance trade became profitable.