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.
It helps show how the bat can make many things
Last one is the best answer
Why were people of the Chinese ethnicity paid less than those of American descent or ethnicity?
What’s the rest of the question this isn’t enough