What is the definition of an Intellectual Disability?

The definition of an Intellectual Disability focuses on significantly sub-average general intellectual functioning. This means that individuals with an Intellectual Disability exhibit cognitive functioning that is markedly lower than the average, typically indicated by an IQ score of approximately 70 or below. This intellectual impairment impacts the individual's ability to learn, reason, and solve problems, which can affect daily functioning and overall quality of life.

Importantly, this definition includes considerations of adaptive behavior, which encompasses practical, social, and conceptual skills necessary for daily living. Thus, individuals must meet these criteria for the diagnosis of an Intellectual Disability, confirming that option B accurately captures the essence of what constitutes this condition.