In what way was christianity a unifying force in medieval europe?
a. the roman catholic church defeated the eastern orthodox church, uniting all christians in western and eastern europe.
b. the roman catholic church controlled trade in europe, which allowed it to spread christianity into asia and africa more easily.
c. the roman catholic church published the bible in many different languages, allowing all europeans to learn about christianity.
d. the roman catholic church was ruled by a single pope, which brought western european christians under one religious leader.

D. The Roman Catholic Church was ruled by a single pope, which brought Western European Christians under one religious leader.

Explanation:

IN medieval Europe, all of the kings and queens from the different monarchies needed approval from the Vatican, this empowered the Vatican and the pope, and gave the Catholic church a sphere of influence over all Europe that made them a unifying force, all monarchs had interests invested in the Vatican, with bishops and archbishops from their families around the political sphere of power at the Vatican. This helped unify Europe under the influence of the catholic church, and since Kings were monarchs sent by God to rule their people, they gained validation from the church by accepting it and embracing it.

the anwser is missions