I think in narrative style I don't know for sure
As an action verb because its an action
A) The urbanization of the United Stats quickened due to technology improvements.
-This whole paragraph is on the subject of how technology quickly urbanized the United States. All of the other answers are factors that caused this to happen.
Hope this helps!
The characteristic that Ralph shows is his bravery as he is defending Piggy against such great numbers ( the entire tribe ).
