d) the diversity of people within the domain of the empire
The early Christian church during the Roman Empire reflected the diversity of people within the empire. The early Christian community was composed of individuals from various social, economic, and cultural backgrounds. It included both Jews and non-Jews, slaves and free individuals, people from different regions of the Roman Empire, and individuals from different social classes. This diversity was one of the notable aspects of the early Christian movement, as it attracted followers from different walks of life, transcending traditional social boundaries. The early church's message of salvation and inclusion appealed to a wide range of people in the Roman Empire, contributing to its growth and spread.