(C) Rationing and shortages. You could also use deductive reasoning for this answer as the other 3 would be positive reasons and would people not want to change versus a lack of food.
In this account, Ethiopia won the battle from sheer courage and support. In account A it differs by stating they won the battle from European training and weaponry that was exchanged while Italy, Britain, and France were fighting against each other.
Explanation:
The Viking age ended when the raids stopped. ... It was no longer profitable or desirable to raid. The Vikings weren't conquered. Because there were fewer and fewer raids, to the rest of Europe they became, not Vikings, but Danes and Swedes and Norwegians and Icelanders and Greenlanders and Faroese and so on