a. Maurice was roughing Holden up to make him pay Sunny the extra fee. Holden called Maurice a dirty moron, so Maurice hit him in the stomach.
b. Holden had made insulting remarks about the caliber of the hotel, the prositute, and Maurice´s job. Maurice didn´t want tonhear it from a teenager, so he hit Holden to shut him up.
c. sunny had lied and told Maurice that Holden had hit her. Maurice believed he was defending sunny.
d. Maurice was just a bully. He enjoyed roughing up the young rich boys.