What Was the Impact of the Decline of Classical Civilizations

What was the impact of the decline of classical civilizations on the major religions?

A) The major religions became more regionalized in specific civilizations.
B) Aside from the emergence of Islam, the other major religions suffered decline.
C) The major world religions actually spread to new areas in which beliefs and cultural allegiances took on new territorial patterns.
D) Hinduism and Daoism shared in the general decline of animist religions during the fall of the major civilizations.