Use this map to answer the question:
Map of Europe and North Africa labeled, Spread of Christianity. Dark green indicates Christian areas, 325 CE. The dark green areas are small, isolated patches surrounding the Mediterranean Sea. Light green indicates Christian areas added by 476 CE. Most of Spain, Gaul, Italy, Greece, and Asia Minor are light green. The light green extends to the European inland, and as far north as parts of Great Britain. It also extends to part of Egypt and Syria, and the North African Mediterranean coast. A grey line indicates the boundaries of the Roman Empire, 476 CE. This line extends around the Mediterranean, from North Africa in the south, beyond Jerusalem to the east, and into northern Gaul.
© 2012 The Exploration Company
Based on the information in this map, which of these conclusions can be drawn about the spread of Christianity?
Christianity spread beyond the western border of the Roman Empire.
Christianity spread through every part of the Roman Empire except the southern border of the Roman Empire.
Christianity spread fully within the borders of the Roman Empire.
Christianity spread through every part of the Roman Empire except the western border of the Roman Empire