The two primary components of the WHO-ICF are:

• A. Functioning and disability; personal factors
• B. Functioning and disability; contextual factors
• C. Body function/structure; environmental factors
• D. Activity/participation; contextual factors

Answer: (B)

The main idea this item tests is how the WHO-ICF is structured into two broad parts: Functioning and Disability, and Contextual Factors. Functioning and Disability covers what a person can do and experiences, including the domains of body functions/structures and activities/participation. Contextual Factors include factors in the person and their environment that can influence functioning, namely environmental factors and personal factors. So the two primary components are Functioning and Disability and Contextual Factors. The other options mix elements that are part of those broad components (like body structures or environmental factors) rather than naming the two big parts) and thus don’t reflect the ICF’s overall organization.