Which of the following is NOT commonly associated with autism?

The characteristic of being "quickly at ease in various social settings" is not commonly associated with autism. Individuals on the autism spectrum often face challenges with social interactions and may struggle to feel comfortable in social environments. This can manifest as anxiety, difficulty making eye contact, or trouble engaging in back-and-forth conversations.

In contrast, unusual patterns of language development, inconsistency in reactions to sensory stimuli, and difficulty with social interactions are well-documented traits that can be found in individuals diagnosed with autism. These traits illustrate the unique neurological wiring and processing differences that characterize autism spectrum disorders. Being relatively at ease in social settings runs contrary to the social challenges faced by many individuals with autism, making it the option that does not align with common characteristics.