Naval Supremacy: The North's Strategic Advantage in the Civil War

Question: The North's naval superiority was most important in the U.S. Civil War because Responses A it kept Britain from reaching the South with troop reinforcements.it kept Britain from reaching the South with troop reinforcements. B the most important battles were fought in along the Atlantic coast.the most important battles were fought in along the Atlantic coast. C the South suffered heavy defeats in all of the naval battles of the war.the South suffered heavy defeats in all of the naval battles of the war. D it allowed the North to blockade the South and shut off most of its trade.