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.
However, determining the precise beginning and ending to any "period" is often arbitrary, since it has changed over time over the course of history.
they died because they wasn't immune to it
The correct answer is C) Unlike the Roman Catholic Church, the Eastern Empire was based in Constantinople.
At that time Roman Empire was divided into two because of its size, the Eastern Roman Empire was also called the Byzantine Empire. It was based in Constantinople - today is known as Istanbul. At that time Catholic Church was the state religion and there was five jurisdictions within the Catholic Church - Rome, Constantinople, Antioch, Jerusalem, and Alexandria.
