Answer:
D). Hyperbole.
Step-by-step explanation:
Hyperbole is used both as a figure of speech to highlight an idea or point and as a comedic technique with a purpose to induce laughter and offer a comic touch to it. This comic or amusing touch or emphasis is provided by the intense exaggeration of common objects that produces a splendid effect leading to evoke laughter.
As per the question, the comedic technique illustrated in the given excerpt is 'hyperbole' as it employs exaggeration('i wouldn't take a hundred for him') to evoke laughter and accentuate the idea 'that dog is a most uncommon dog'. Thus, option D is the correct answer.