<span>i think the answer is C. an obvious exaggeration that is used for its comedic effect</span>
You can eliminate C because that is a Flat Character.
The answer is A from what I see.
<span>The correct answer for the question that is being presented above is this one: "c. a logical and intelligent person who is impressed by Sherlock Holmes's powers of deduction." In "The Adventure of the Blue Carbuncle," Dr. Watson is describes as a logical and intelligent person who is impressed by Sherlock Holmes's powers of deduction</span>