A map titled The Extent of Christianity. A key shows Christianity, circa 300 C E in purple, Christianity, circa 600 C E in orange, Christianity, circa 800 C E in green, and Modern borders with a gray line. Cities within purple areas include Carthage, Rome, and Jerusalem. Cities within orange areas include Alexandria and Athens. Cities within green areas include London and Cologne.
This map shows the spread of Christianity. Which of these areas converted to Christianity by 600 CE? Choose four correct answers.