I believe D would be the most reasonable answer for this question given that it has factual information that well suits a topic sentence.
The primary theme in An Occurrence at Owl Creek Bridge is (C) the line between dreams and reality is thin. Throughout the course of the short story, the illusion of Farquhar represents a reality for the readers. So it shows how thin the line is between fantasy and reality.
Answer:
Believe in yourself instead of conforming to the values of others.
Explanation:
Philosopher Ralph Waldo Emerson in his essay "Self Reliance" argue about the effect of polite society on an individual's personal growth. Only self sufficiency is capable of providing freedom to an individual in discovering their true self and worth, bringing forth true independence on the individual.
He emphasized on the importance of an individual to follow their own voices rather than trying to conform to the dictates and values set by the society. He posits the issue of self reliance in oneself and the importance of the imaginary thinking capacity of an individual. He also argues that the most important realization for an individual is trusting himself. He promotes self reliance as an ideal virtue for everyone. "Believe in yourself instead of conforming to the values of others" best sums up the passage provided in the question.