Answer: B
explanation: nuclear energy harms the environment
Greg's final feelings toward and perspective about his father Greg is angry at his father because his father will not let him play basketball. His thoughts and actions suggest that he disagrees with his father's perspective and feels that his father doesn't understand him.
A. because, as a result, therefore
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.