Need help on history?

Catholic

At all times, traditions of folk religion existed largely independent from official denominations or dogmatic theology. From the Middle Ages onwards, as the centralized Roman power waned in southern and central Europe, the dominance of the Catholic Church was the only consistent force in Western Europe.

answer; ///i believe that the correct answer is (a); ///the crystal will

it would be a. that is the only one i could think of