Answer:
People are or seem to be difficult because they are layered, behind each of their actions and behaviours there are a hundred reasons
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.
The best definition would be...
A written document made by hand
~Hope I Helped
