The answer which is an example of a theme with a dual nature is D. people who work hard learn values but may not prosper.
The other sentences are pretty linear and expected - a person works hard and is successful in life. D is somewhat different, which is why it has two natures, or a dual nature.
Answer:
A. The narrator thinks Jasper is foolish.
Explanation:
The best that expresses the narrator's viewpoints towards Jasper is that "the narrator thinks Jasper is foolish".
From the excerpt, it is very clear that the narrator thinks Jasper is foolish. One is termed foolish is if he/she refuses to heed to warning. A foolish person is seen to be unwise and definitely lacks wisdom. Jasper displayed that because he was oblivious of the figure he cut out.
His foolishness is seen in his not making proper enquiries about the whereabouts of Thomas.
Therefore, Option A is the correct answer.