**Core Concept**
The question is testing the diagnosis of a behavioral disorder in children, specifically one that involves aggression, impulsivity, and antisocial behavior. The underlying concept is the understanding of Conduct Disorder (CD), a condition characterized by a pattern of negative, hostile, and defiant behavior in children and adolescents.

**Why the Correct Answer is Right**
Conduct Disorder is a psychiatric disorder that is typically diagnosed in children and adolescents. It is characterized by a persistent pattern of behavior that violates the rights of others or major age-appropriate societal norms or rules. The behavior is often aggressive, such as fighting or bullying, and can also involve property damage, theft, or vandalism. In this case, the child's frequent fights with other children, disciplinary problems in school, and history of stealing suggest a diagnosis of Conduct Disorder. The child's behavior is not simply a result of normal childhood misbehavior, but rather a pattern of behavior that is persistent and interferes with the child's relationships and daily functioning.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the diagnosis of Conduct Disorder. Oppositional Defiant Disorder (ODD) is a separate diagnosis characterized by a pattern of angry/irritable mood, argumentative/defiant behavior, or vindictiveness. While ODD can co-occur with Conduct Disorder, the two conditions have distinct diagnostic criteria.
* **Option B:** Attention Deficit Hyperactivity Disorder (ADHD) is a neurodevelopmental disorder characterized by symptoms of inattention, hyperactivity, and impulsivity. While children with ADHD may exhibit some of the same behaviors as those with Conduct Disorder, such as impulsivity, the two conditions have distinct diagnostic criteria and underlying pathophysiology.
* **Option C:** This option is not a valid diagnosis. While autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by difficulties with social communication and interaction, restricted/repetitive patterns of behavior, and interests, it is not associated with the aggressive or antisocial behavior described in the question.
* **Option D:** This option is not relevant to the diagnosis of Conduct Disorder. Substance use disorders are a separate category of psychiatric disorders characterized by the use of psychoactive substances despite negative consequences. While substance use can co-occur with Conduct Disorder, the two conditions have distinct diagnostic criteria and underlying pathophysiology.

**Clinical Pearl / High-Yield Fact**
Children with Conduct Disorder are at increased risk of developing other psychiatric disorders, such as substance use disorders, major depressive disorder, and anxiety disorders. Early identification and treatment of Conduct Disorder are critical to preventing long-term consequences, such as delinquency, incarceration, and poor academic and employment outcomes.

**Correct Answer: D. Conduct Disorder**