Answer:
C. The Roman Empire persecuted Christians.
Step-by-step explanation:
From the beginnings of Christianity, the Roman Empire was hostile to this new religion. Romans were mostly welcoming towards the various religions, but Christianity forbids worshipping of idols other than God, which went against the Roman idealization of the emperors.
Nero was the first emperor that started persecution. He even blamed the great firs of Rome on the Christians. They were punished for their beliefs, especially if they went against the imperial ideas.
Finally, after the split of the empire, the emperor of the Eastern Roman Empire, Constantine, signed the Edict of Milan in 313 AD. With this legal document, Christianity became a legal religion. In 380. Theodosius I proclaimed that Christianity is the state religion of the Roman Empire by the Edict of Thessalonica.