Paradoxically, How Did the Church Itself Contribute to the Decline

Paradoxically, how did the Church itself contribute to the decline in religious observance in general?

A) The Church's large-scale reform efforts had been for the most part unsuccessful, leaving clergy and parishioners uneducated and disenchanted with religion.
B) The exposure of the clergy to cosmopolitanism led large numbers of them to leave the Church and become atheists.
C) Many educated clergy had come to participate in cosmopolitanism, viewing their parishioners as primitive and imposing strict standards on them.
D) The number of clergy rose due to the increase in and popularity of religious philosophy, causing there to be too many churches to have a good turnout at each.
E) Especially in rural areas, parishioners and clergy became too likeminded, often blurring distinctions between who had the authority and who did not.