Answer:
D). The narrator.
Step-by-step explanation:
Twain is one of the most celebrated realists of all time and humor was his most common weapon to satirize and emphasize the situational elements. 'The Notorious Jumping Frog of Calaveras County' by Mark Twain portrays satire through humor and exaggeration.
As per the question, the words brisk and businesslike would best describe 'the narrator' as he possesses the attributes corresponding to liveliness and activity. His portrayal has been juxtaposed with Wheeler to reflect and emphasize the differences(regional) between the east and west part of the United States. Thus, option D is the correct answer.