**Core Concept:** Autism Spectrum Disorder (ASD) is a neurodevelopmental disorder characterized by impairments in social interaction, communication, and repetitive and restricted behaviors.

**Why the Correct Answer is Right:** Option C, "Impaired social cognition," is not seen in autism. Social cognition refers to the ability to perceive, understand, and respond to social information, which is impaired in ASD. In contrast, individuals with autism exhibit strengths in areas like visual perception, memory, and attention.

**Why Each Wrong Option is Incorrect:**

A. **"Impaired social motivation":** While some individuals with autism may have reduced social motivation, impairments in social cognition are more fundamental and encompass a broader range of social skills.
B. **"Delayed language development":** Although language delays are common in ASD, impairments in social cognition are more relevant to the condition, rather than language issues.
D. **"Impaired theory of mind":** Theory of mind refers to the ability to attribute mental states to oneself and others, recognizing that others have beliefs, desires, and intentions. While individuals with autism may struggle with theory of mind, impairments in social cognition are a more encompassing characteristic of ASD.

**Clinical Pearl:** A correct understanding of ASD involves recognizing that impairments in social cognition are a core feature, rather than focusing solely on language or theory of mind impairments. This knowledge helps guide clinical assessment, diagnosis, and treatment planning for patients with autism spectrum disorder.

**Correct Answer:** C. Impaired social cognition.