Answer:
b. prayer meetings and Bible readings by soldiers in both armies
Explanation:
Civil War Revivals is considered to have been characterized by increased in religious activities and practice among soldiers, such as prayer meetings and Bible readings by soldiers in both armies. (Union and Confederate)
In other words, Civil War Revivals involves various religious activities in which soldiers are active or shown interest in the areas of religious ceremonies, preaching services, organized prayer meetings, and different types of group talk involving each soldier to share their personal encounter with the group, on how God had improve thier faith in Christ.
These actions were made popular through a lots of soldiers who were seen having private Bible reading and small informal prayer meetings among the troops.