From around 1795 until 1835, there was a Protestant religious resurgence in the United States known as the Second Great Awakening.
Meetings were held in little villages and large cities across the country during this revival, and the camp meeting, a unique frontier institution, was born.
Option A is correct people focused on reforming and improving society.
Other Options are incorrect as :
Thus Option A is the effect of Second Great Awakening.
For more information about Second Great Awakening refer to the link:
https://brainly.com/question/11489694