How did the viking invasion affect the monasteries? a. the monks fought back but could not win against the strong vikings. b. the vikings stole all the manuscripts from the monasteries. c. vikings took over the monasteries and burned them down. d. in 806, the monks from iona fled to kells for safety.

D). In 806, the monks from Iona fled to Kells for safety.

Explanation:

The Viking invasion across the Eastern as well as Western Europe had a lasting impact on the churches and monasteries. They were famous for plundering and devastation of objects like Frankish silver cups , etc. from the churches and ecclesiastical silver(from monasteries). The ravaging and looting went to such an extent that the 'monks from lona fled to Kells to protect themselves from the Viking attackers. Thus, option D is the correct answer.