Dr Santos Is Investigating the Positive Effects of Drugs Using

Dr. Santos is investigating the positive effects of drugs using an animal model paradigm. She establishes two different cages: cage A is neutral and drug-free, while cage B contains a drug. She exposes the animal to both cages and records the amount of time the animal spends in each cage in an attempt to assess the positive effects of the "drug environment." Which type of model is she using?

A) Operant discriminant model
B) Classically conditioned preference model
C) Shaped preference model
D) Conditioned place preference