Constantine changes the religious policy of the Roman Empire by making Christianity the official religion of the Roman Empire. Thus, option A is correct.
Who is Constantine?
Constantine was the emperor of Rome, when he was made emperor the civilization was not that managed but alter he emerged won many wars and was also gave a rebirth to Christianity in Rome, and made many memorials and structures for the same.
Constantine was the first emperor to pronounce himself a Christian not only, but he had various churches made in his time and also made some great reforms for the Christian.
That increased the number of Christian people that were living at that time, and there were lots of conversions happening after his declaration. He had the Roman Empire adopted Christianity as its official religion. Therefore, option A is the exact option.
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