Which of the Following Was a Change Seen in Roman

Which of the following was a change seen in Roman social order in the third century C.E.?

A) The traditional military base of the ruling class was decimated by economic losses.
B) Distinctions among the classes by dress virtually disappeared.
C) The most important class distinction was drawn between senators and equestrians.
D) It became more difficult for individuals to move from lower social orders to higher.