Final answer:
Among 'Gatsby', 'Daisy', 'Tossing shirt', and 'Rain', the item that does not belong is 'Rain' because it doesn't refer to a specific scene or character in Fitzgerald's novel 'The Great Gatsby' as the others do.
Step-by-step explanation:
The item that does not belong among 'Gatsby', 'Daisy', 'Tossing shirt', and 'Rain' is Rain. Gatsby, Daisy, and tossing shirts are specific references to characters and a notable scene in F. Scott Fitzgerald's novel 'The Great Gatsby', whereas rain does not have a particularized meaning relative to the other items in the context of Fitzgerald's work. In 'The Great Gatsby', the scene where Gatsby is tossing his shirts is a significant moment of emotional release and material wealth display. It's a pivotal scene showcasing different dimensions of Gatsby's and Daisy's characters, reinforcing Fitzgerald's portrayal of these figures as nuanced and unique, rather than universal archetypes.