In Which of These Ways Did the Romans Exhibit Their

In which of these ways did the Romans exhibit their pragmatism and flexibility?

A) They allowed their soldiers to adopt different religions.
B) They incorporated conquered peoples into their military to assure they had strong numbers.
C) They took a large number of defeated peoples back to Rome to serve as manual laborers.
D) They permitted full citizenship to certain conquered peoples, thereby allowing those people to feel a deep affinity for their new leaders.
E) They encouraged their soldiers to marry young women from the conquered groups.