The theme of loneliness can be seen when A. Crooks tells Lennie he can't come into his room. B. Curley accompanies the ranch hands to Susy's. C. Lennie spends time in the barn with his puppy. D. Candy agrees to contribute his money to help purchase the farm.
In "Of Mice and Men", the theme of loneliness is present when Lennie is isolated from the other men, like in chapter 4, when A. Crooks tells Lennie he can't come into his room.
