How did the coastline of the Confederacy offer the South an advantage during the Civil War?

A) It enabled the South to implement the Anaconda Plan.

B) It gave the South complete control of the Mississippi River.

C) Its length made it hard for the North to control.

D) It shortness made it easy to defend against invaders.

Actually I disagree with A. The north implemented the anaconda plan not the south. I would say C. Because during the anaconda plan people started starving in the south. The north had blocked off all ships that went to deliver food or goods to the south. Of course the occasional smuggler got through but that wasn't enough to feed the entire south. Their long coastline gave them the advantage because they managed to get some goods through. As well as to the Mississippi which also gave them ways to move goods.