Answer:
c. Vikings took over the monasteries and burned them down.
Explanation:
The Vikings were fierce Scandinavian navigators and warriors from the lands that are now Sweden, Norway, and Denmark.
They raided the coasts of Europe from the eigth century to the eleventh century, when they were christianized.
Monasteries were a particularly vulnerable target for Vikings, because they were inhabited by monks who did not have combat skills. For this reason, Vikings often raided monasteries.
In fact, the first documented Viking raid was in the monastery of Lindisfarne, in Northern England. The attack was devastating, and spread fear in the Christian world.
