How did the Norse conquerors have a great impact upon the development of civilization in the West? ...

How did the Norse conquerors have a great impact upon the development of civilization in the West?
 
  A) Norse conquerors spread Christianity wherever they went, establishing civilization throughout Europe.
  B) The Norse conquered critical trade ports and integrated their culture with those they conquered and spread this culture as they continued to conquer.
  C) William the Conqueror conquered Anglo-Saxon England under the banner of the pope. He made great innovations in the administration of justice that influenced today's government. Other Norse conquered critical trade ports and integrated their culture with those they conquered and spread this culture as they continued to conquer.
  D) The Norse spread civilization to areas still controlled by barbarians. They were able to do this because of their advanced seafaring skill and desire to expand.
  E) William the Conqueror conquered Anglo-Saxon England under the banner of the pope. He made great innovations in the administration of justice that influenced today's government.