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The rise of christianity in the Roman Empire was different to that of medieval Europe.
In the Roman Empire, christians were persecuted at the beginning and very slowly increased the amount of people who believed in their god. However, as time passed, more and more people identified themselves as belonging to the christian religion.
In medieval Europe on the other hand, christianity became popular much faster, as there was not that much opposition, compared to the times of Roman empire.
The correct answer is letter D. The Ordinary is the part of the mass that has unchanging texts regardless of the calendar date or festival being celebrated by the Catholic Church. The Ordinary is the part of the mass that is also contrasted to the proper, which varies according to the observance being held in the liturgical year.