In Which of These Ways Did the Romans Exhibit Their

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

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