Most likely, the Christianity first reach Constantinople on the Black Sea by the 400 A.D.
How did Christianity reach Constantinople?
Constantine I, which was the Roman emperor from 306-337 CE was famous for the his conversion to Christianity in 312 CE and his subsequent Christianization of the Roman Empire.
During the 7th century B.C., the Constantinople has developed into a thriving port because to its prime geographic location between Europe and Asia and its natural harbor.
In the 330 A.D., it became the site of Roman Emperor Constantine's “New Rome,” and a Christian city of immense wealth and magnificent architecture.
Hence, most likely, the Christianity first reach Constantinople on the Black Sea by the 400 A.D.
Therefore, the Option A is correct.
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