I think it's D. The use of farming to feed a larger population.
Answer:
The Social Gospel Movement was a religious movement that arose during the second half of the nineteenth century. Ministers, especially ones belonging to the Protestant branch of Christianity, began to tie salvation and good works together. They argued that people must emulate the life of Jesus Christ.
The new strategy was reinforced once Ulysses S. Grant took control of the Union Army and started taking more of an aggressive approach. He had the army start attacking in a more antagonistic fashion.
