The correct answer is C) they could not agree on how to best defend the region. They decided to negotiate instead.
The English were unsuccessful in launching an attack against the Vikings because they could not agree on how to best defend the region. They decided to negotiate instead.
The Vikings were Scandinavian people that live in tribes in what today is Norway and Sweden, They were known to be fierce and terrible warriors that had no mercy. They destroyed towns and burned houses, and that is how they conquered some European territories, including some parts of England.
Specifically, the Vikings arrived and destroyed what at that moment was known as the East Anglia. These testimonies are part of the raids in cluded in the Anglo Saxon Chronicle.