How is “a& p” an example of postmodernism?

 A & P is an example of postmodernism. In the story, the main character with the name Sammy left his work without realizing how it will affect his parents. He only has self-concern that leads to his personal decision. He appears to have a mindset more favor to his personal gain compared to have a systematized movement. Sammy is an example of postmodernist because he did not try to refine his mind about what is wrong or right. He asserted individualism and his system place is lost and continue to be unsure on his next step.

My answer is b but i dont know if im right