**Core Concept**
Intellectual disability is a condition characterized by significant limitations in cognitive functioning and adaptive behaviors, which cover a range of everyday social and practical skills. The treatment of intellectual disability often involves a multidisciplinary approach, including pharmacological interventions, behavioral therapies, and educational support.

**Why the Correct Answer is Right**
The correct treatment for a child with intellectual disability depends on the underlying cause and the severity of the condition. However, in many cases, antipsychotic medications such as risperidone (Option C) are used to manage behavioral symptoms like aggression, anxiety, or hyperactivity. Risperidone works by blocking dopamine and serotonin receptors in the brain, which can help reduce symptoms of agitation and aggression.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a treatment for intellectual disability. While some medications may be used to manage symptoms, this option is too vague.
**Option B:** This option is incorrect because it is a class of medications typically used to treat attention deficit hyperactivity disorder (ADHD), not intellectual disability.

**Clinical Pearl / High-Yield Fact**
When treating intellectual disability, it is essential to consider the potential side effects of medications, especially antipsychotics, which can include weight gain, sedation, and increased risk of diabetes.

**Correct Answer: C. Risperidone**