Answer:
B. It caused the beginning of the Civil War.
Explanation:
The Battle of Fort Sumter did not cause the Southern states to secede, as seven slave states had already seceded by the time the battle took place. However, the battle marked the beginning of the American Civil War.
The Battle of Fort Sumter took place in April 12-13, 1861 at Fort Sumter, near Charleston, South Carolina between the South Carolina militia (which will later become part of the Confederate Army) and the United States Army.