What was the importance of Fort Sumpter?

Following Beauregard's bombardment in 1861, Confederate forces occupied Fort Sumter and used it to marshal a defense of Charleston Harbor. Once it was completed and better armed, Fort Sumter allowed the Confederates to create a valuable hole in the Union blockade of the Atlantic seaboard.

the answer is a) high entry costs

c. archbishop desmond tutu promoted the acknowledgement of the rights of black africans and expose human rights abuses.

d. leader haile selassie modernized african society through the institution of progressive social, economic, and educational reforms.