Assertion (A): The Assertion is correct. In the social history of the West, a major transition was the separation of religious and political authority, moving away from the idea of a unified system, where both religious and political authorities had power over the same people.
Reason (R): The reason correctly describes the process of secularisation, where religion was separated from the state and became a private matter. Earlier, religious practices were seen as mandatory for citizens, which transformed into matters of personal choice, and became a practice undertaken by individuals and communities.
Connection: The process of secularisation mentioned in the reason was linked to this separation of religious and political authority, thus the reason correctly explains the assertion.