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.
The answer that corrects the shift in verb tense in the given sentence above is: To earn his allowance this week, Josh must mow the lawn and trim the bushes. The correct answer is option D. This sentence shows a condition therefore, the verbs that should be used is in the present form.