Which was an achievement of the roman empire?

a. banning the use of coins
b. conquering the world
c. starting a civil service
d. posting the twelve tablets

pretty sure it isn't d but if it really is let me know : )

the correct option is:  

c. starting a civil service.  

augustus caesar instituted the roman empire by establishing civil service.  

an executive committee, the consilium, of the senate was installed to augustus preparing senatorial business. he also expanded his own staff to create the origins of a civil service, which had never existed previously and would become indispensable for the imperial system.

your answer is actually c.starting a civil service .

hope this ! have a great day!