The correct answer to this open question is the following.
Unfortunately, you forgot to include the map to answer your question.
However, we can comment on the following. Hope it is useful.
We did some research and found a map titled "The Viking Age, A.D. 800-1000." The map is included in a lesson to develop Geography skills such as interpreting symbols, lines, and labels.
If this is the correct map to your question, then the correct answer is the following.
The city on the map that is farthest from the Vikings' homeland is Rome, followed by Paris, and the closest city to Vikings homeland, that appear on the map is London.
The homeland of the Vikings was the modern-day Scandinavian territories of Sweden, Denmark, and Norway.
"The cause of" would be the answer
They’re just missing an R
