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The reported rates of autism spectrum disorder have risen sharply since the 1980s. For instance, California experienced a 273% surge in cases between 1987 and 1998, and the entire United States saw a 78% increase in diagnoses from 2000 to 2008.

Increase in Autism Spectrum Disorder Prevalence

The significant rise in autism spectrum disorder diagnoses may not reflect a true increase in the disorder's occurrence. Instead, it is likely attributed to several factors, including the expansion of diagnostic criteria, more proactive efforts to identify cases within communities, and heightened public awareness and acceptance. Additionally, improved knowledge and diagnostic skills among mental health professionals have enabled them to identify more subtle cases.

Factors Contributing to Increased ASD Prevalence

Data from the late 20th century shows a dramatic increase in the number of children diagnosed with autism spectrum disorder, with some regions reporting increases of over 200% in a single decade. Based *only* on this information about the rate of diagnosis, which of the following is the most critically sound evaluation of the situation?

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