The correct answer is D. Helped spread Christian teachings to new areas.
Explanation:
Monks and missionaries are part of specific religions, especially members of the Catholic or Christian Church. Additionally, the role of monks and missionaries was quite similar during the Middle Ages and following centuries because they helped spread the religion by teaching people about it.
In the case of monks, they lived in monasteries in remote areas and instructed people of the area about the Christian religion, as well as new monks. On the other hand, missionaries traveled to other cities, regions, or countries to teach the people there about religion. According to this, both "helped spread Christian teachings to new areas".
