What Challenges Did the Catholic and Protestant Churches Face Following

What challenges did the Catholic and Protestant churches face following the Civil War?

A) Surges in immigration lead to distinct ethnic and cultural differences regarding how catholic and protestant worshippers approached their faiths.
B) Catholic and Protestant churches in the North were unable to embrace church goers who fought on the side of the South.
C) Male causalities as a result of the war changed the complexity of religious practices.
D) An influx of black churchgoers assimilated into congregations who were not ready to have them.