What New Obligations Did the Emperors Impose on the Curials

What new obligations did the emperors impose on the curials, the social elite in the towns, in response to Rome's economic problems?

A) The emperors forced them to perform menial labor on tenant farms because so many tenant farmers had fled.
B) The emperors drafted them into the army and required them to serve a minimum of five years.
C) The emperors forced them to come to Ravenna and Constantinople to work as servants for the emperors.
D) The emperors forced them to serve as unsalaried members of the city senate and to use their own money to support the community.