The correct answer is A) all people in the Roman Empire freedom to worship whatever god they wished.
In 313, Constantine issued the Edict of Milan granting all people in the Roman Empire freedom to worship whatever god they wished.
Roman Emperor Constantine is the one who officially established Christianism in the Empire with the Edict of Thessalonica. But in the Edict of Milan, Emperor Constantine ordered to respect Christians if they wanted to practice their belief system. This not only included Christians but other religious practices, as well. It was a show of tolerance from the Roman Emperor.