## **Core Concept**
The question describes a scenario suggestive of a specific psychological or psychiatric condition affecting a child's behavior and speech. The key details provided are the child's preference for not speaking at school but speaking normally in other places, along with a normal IQ assessment.

## **Why the Correct Answer is Right**
Selective mutism is a condition characterized by a child speaking in certain situations or to certain people but not in others, despite having the ability to speak. This condition often presents with the child speaking freely at home or with family but refusing to speak in school or to certain individuals. A normal IQ assessment helps to rule out intellectual disability as a cause for the child's behavior. The condition is not due to a lack of knowledge of the language or a speech disorder but is considered a type of anxiety disorder.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is blank and cannot be evaluated.
- **Option B:** This option is blank and cannot be evaluated.
- **Option C:** This option is blank and cannot be evaluated.
- **Option D:** This option is blank and cannot be evaluated.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl in this scenario is to differentiate selective mutism from other conditions that might present with similar symptoms, such as autism spectrum disorder or a specific phobia. The critical distinguishing feature here is the context-specific nature of the mutism and the presence of normal speech in other settings, along with a normal IQ.

## **Correct Answer:** D. Selective Mutism.