Why Was the Battle of Shiloh Significant

Why was the battle of Shiloh significant?

A) It ended with the least casualties of any Civil War battle and demonstrated advancements in artillery.
B) It was a highly strategic battle, putting an end to a series of battles won through lucky accidents.
C) Grant realized that the only way that the Civil War would come to an end would be through "complete conquest."
D) It was the last battle of the Civil War, resulting in a decisive Union victory and the Confederacy's surrender.
E) It was one of the few battles to take place in the North and caused some Union land to be lost to the Confederacy.