Text stimulus (diagram): Left-to-right concept diagram titled Impairment, Barriers, Supports, and Participation. Left box: Individual impairment or health condition. Middle box: Environment, policies, attitudes, tools. Under the middle box, show two smaller labeled icons: Barriers and Supports. Right box: Level of participation in school, work, and community activities. Arrows from left box to middle box and from middle box to right box. Blank area: the second arrow label blank for students to infer. Which label best completes the arrow from barriers and supports to participation?