Those Who Ruled Rome from 96 to 180 C

Those who ruled Rome from 96 to 180 c.e.were called the "Five Good Emperors" because they:

A) liberated soldiers from harsh discipline in the army.
B) built bridges of understanding with the barbarians.
C) were all descendants of Caesar Augustus.
D) were capable administrators who governed successfully.
E) completed the transformation of the empire into a republic.