Which of the following could include a classical conditioning-based behaviour therapy designed to treat alcohol abuse

A)  negative punishment
B)  exposure therapy 
C)  aversion therapy
D)  systematic desensitization

Aversion therapy involves pairing a negative stimulus with the behavior that is to be eliminated, such as pairing a nauseating drug with the consumption of alcohol in order to create an aversion to alcohol. This is a classical conditioning-based behavioral therapy often used to treat alcohol abuse. The other options listed (negative punishment, exposure therapy, and systematic desensitization) are behavior therapies, but they are not necessarily classical conditioning-based and are not typically used to treat alcohol abuse.