**Core Concept**
The question is testing the concept of "rationalization" or "projection" in the context of psychological defenses and their relationship to addiction. Rationalization is a defense mechanism where an individual attributes their own unacceptable thoughts, feelings, or behaviors to someone else, often to avoid taking responsibility for their actions.

**Why the Correct Answer is Right**
The chronic alcoholic in this scenario is using rationalization to deflect blame for their addiction onto their family environment. This is a classic example of projection, where they attribute their own feelings or behaviors to someone else. By doing so, they avoid acknowledging their own role in their addiction and the consequences of their actions. This defense mechanism is a common coping mechanism for individuals struggling with addiction, as it allows them to maintain a sense of self-control and avoid feelings of guilt or shame.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the defense mechanism being used by the chronic alcoholic.
**Option B:** This option is incorrect because it is not a specific defense mechanism that is commonly associated with addiction.
**Option C:** This option is incorrect because it is not a relevant defense mechanism in this scenario.

**Clinical Pearl / High-Yield Fact**
It is essential to recognize that addiction is a complex condition that involves multiple factors, including psychological, social, and environmental influences. By understanding the defense mechanisms used by individuals with addiction, healthcare providers can develop more effective treatment plans that address the underlying psychological issues.

**Correct Answer: C. Denial.**