After Jesus' crucifixion, his followers called him <em>Christ, </em>meaning the anointed one. The anointed one is usually transliterated into English (since it is a Jewish word) as Messiah. He is called Christ because it was believed he is the awaited Messiah in Bible.
The answer that best describes how African Americans participated in the war effort during World War II is letter B. They were fully integrated into the armed forces and fought alongside whites. They actually volunteered to join
The battle you are referring to is actually called the Battle of the Ironclads. In this battle, it was the Merrimac (from the Confederacy) versus the USS Monitor (from the Union). This was the first battle between iron-fortified vessels in the Civil War. This battle ended up in a draw but represented a new form of fighting that both the Union and Confederacy had to be ready for.