Final answer:
Eric Lee's need for hand assistance to brush his teeth at 16 years old suggests he may have an Intellectual Disability rather than Autism Spectrum Disorder, as it demonstrates substantial difficulty in performing everyday practical skills, which is a characteristic of Intellectual Disability (option A).
Step-by-step explanation:
Based on the information provided about Eric Lee, who at the age of 16 requires hand assistance to brush his teeth, his abilities align more with an Intellectual Disability rather than Autism Spectrum Disorder (ASD). Intellectual Disability is characterized by significant limitations in intellectual functioning and adaptive behavior, which covers many everyday social and practical skills. This condition originates before the age of 18. The detail about needing hand assistance for brushing teeth suggests Eric has substantial difficulty performing a routine daily life skill, indicating a possible Intellectual Disability.
The options provided suggest various levels of this condition, and to accurately determine whether it is mild, moderate, or severe, more information on Eric's overall functioning would be required. ASD is a neurodevelopmental disorder mainly affecting social interaction and can range greatly in its severity, but what distinguishes it from intellectual disability is the presence of impaired social skills alongside other potential symptoms like repetitive behaviors and unusual language usage.
Hence, the answer is option A.