Shameer Is Addicted to Heroin and Found Out About an Injection

Shameer is addicted to heroin and found out about an injection site in Vancouver Canada, not far from his apartment.He decided to go there where he can inject under the supervision of a medical professional and won't have to share needles.He is planning to quit and is hoping that someone there will be able to help him do so eventually.According to ______, he is in the preparation stage.

A) the transtheoretical model
B) the self-efficacy model
C) the health belief model
D) learning theory