An Offender Goes Out Each Night and Tries to Open

An offender goes out each night and tries to open the doors of cars parked in the community. Occasionally, the offender finds a car door that has been left unlocked, enters the vehicle, and steals any valuable contents in it. What is the schedule of reinforcement illustrated in this example called?

A) Inconsistent reinforcement schedule
B) Intermittent reinforcement schedule
C) Infrequent reinforcement schedule
D) Undetermined reinforcement schedule
E) Negative reinforcement schedule