Which of the Following,in Addition to the Charisma of Its

Which of the following,in addition to the charisma of its leaders,was a reason for Christianity's growing success before Constantine's endorsement?

A) The fit between the church's doctrines and popular preexisting beliefs and practices made conversion smoother.
B) The church's militant appeal to Roman warrior ethos encouraged the conversion of soldiers.
C) The church's appeal primarily to the poor and downtrodden rapidly increased its numbers.
D) The church's egalitarian institutional structure appealed to people chafing under hierarchical imperial rule.