Beginning in the Middle East, Christianity began its spread north and west into Europe, carried by merchants, missionaries, and soldiers. ... As a result, in 313, the Edict of Milan was passed, which guaranteed freedom of religion throughout the Roman Empire, ending the persecution of Christians.
Europe does not have common boundary with South America, North America and Oceania.
C because the progressive movement was meant to widen social an political reforms
"To be ignorant of what happened before you were born is to be ever a child"
The answer is A.