It could mean many things but the most common explanation is to own up to your mistakes. to not walk around looking for someone else to blame. It depends on how it's used in context though.
D. He created rules for his colony
Establishment of a communist society, namely a socioeconomic order structured upon the ideas of common ownership of the means of production and the absence of social classes and money
Answer: He made christianity legal in the roman empire with the Edict of Milan in 313