The idea the writer wishes to convey about the subject—the writer's view of the world or a revelation about human nature. To identify the theme, be sure that you've first identified the story's plot, the way the story uses characterization, and the primary conflict in the story.
I guess A but I literally just saw a report that says that Kim attended a ceremony marking the completion of a fertilizer plant in Sunchon, in the South Phyongan Province Saturday.