In Phase 1 of a Choice Experiment Involving Concurrent VI

Multiple Choice

In phase 1 of a choice experiment involving concurrent VI schedules,a human subject receives 25% of his reinforcers by making a left response.In phase 2,he receives 75% of his reinforcers by making a left response.The subject's percentage of left responses is 40% in phase 1,and 60% in phase 2.This performance is an example of

A) matching
B) undermatching
C) overmatching
D) bias