What is a key characteristic of Asperger's Syndrome?

A key characteristic of Asperger's Syndrome is that individuals typically have developmentally appropriate language skills. While people with Asperger's may exhibit difficulties in social communication and may not always use language in a socially typical manner, their language development occurs within a typical range. This means they can often speak in complete sentences, have an extensive vocabulary, and use language effectively in various contexts—though they may struggle with pragmatics, such as understanding social cues or nonverbal communication.

The other choices highlight characteristics that do not align with Asperger's Syndrome. For instance, individuals with this condition typically do not show severe cognitive impairment; in fact, many have average or above-average intelligence. They also tend to have intense interests and focus on specific topics rather than lack focus. Additionally, while language usage challenges might occur, an inability to form sentences is not characteristic of the syndrome. Thus, developmentally appropriate language is a defining feature of Asperger's Syndrome, making it the correct answer.