Asingular subject requires which type of verb

How is the freytag's pyramid not related to the conclusion of the story? a) according to freytag's pyramid, the exposition consists of the conclusion of the story. b)according to freytag's pyramid, the exposition consists of the climax. c)according to freytag's pyramid, the exposition consists of the introductory material. d)according to freytag's pyramid, the exposition consists of the falling action of the story.