Bill Spends His Summer in the City Panhandling

Bill spends his summer in the city panhandling. Every day he takes a position on a busy corner and accosts passersby saying, "Can you spare some changeMost people ignore him, but every now and
Then someone gives him money. Bill's reinforcement schedule is best described as a _________.

A) fixed ratio schedule
B) variable ratio schedule
C) fixed interval schedule
D) variable interval schedule