B because since he is writing about the character
Dexter Green of "Winter Dreams" is a dynamic character.
A dynamic character is one who changes as the story progresses. A static character is one who remains constant from the beginning of the story until its end.
Dexter Green is a dynamic character because in the first part of the story he was a dreamer, he has been in a relationship for quite some time. However, as the story progresses he has changed. He left the woman he loved to pursue his dreams. His priorities have changed as well as his mindset. His changes was brought about by his experiences in life.
Oxymoron for instance " jumbo shrimp"
It is saying to give the definition of the word ambiguous, if that didnt help then you need to ask more clearer.