Why does gladwell use the word "bargain" instead of "agreement" or "deal"?

Read this passage from an analysis essay: allegories do three things. first, they tell a story. allegories also have multiple meanings. finally, allegories offer a moral lesson. which best uses parallelism to revise this passage? a. telling a story, having multiple meanings, and moral lessons: these are the things allegories do. b. allegories, tell a story, multiple meanings, and a moral lesson. c. allegories tell a story, have multiple meanings, and offer a moral lesson. d. allegories tell a story, and have multiple meanings and offer a moral lesson.2b2t