Explain why many barbarian tribes converted to Christianity during the fourth century. Please use actual sentences and NOT one or a few words !!

barbarian tribes converted to Christianity during the fourth century after they became a part of Roman society. ... Over time these tribes adopted Roman culture and become Romanized. As Christianity spread, more political opportunities became open to followers of that faith, and many tribal leaders began to convert.

the answer is c, all the other options are things they are known for.

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the fundamental orders of connecticut it would be the letter b