Answer:
b. the empire accepted Christianity
Explanation:
Constantine the Great popularly known as Constantine I was a Roman Emperor who served as a leader (king) from the 25th of July, 306 to the 22nd of May, 337. He was born on the 27th of February, 272 in Naissus, Roman Empire.
Also, Constantine the Great was the first among all the Roman Emperors to embrace Christianity, haven been a pagan i.e Constantine I was the first to convert to Christianity, although, the conversion happened while he was on his deathbed.
Furthermore, Constantine the Great played a significant role in making the Roman Empire to be greatly tolerant (liberty and freedom) to Christianity (Christians) through the proclamation (passage) of the Edict of Milan in C. 313.
Hence, under the rule of Constantine, what changed in the empire was that, the empire accepted Christianity.
