Describe the main components of a wheelchair and the factors that determine appropriate seating and positioning for an individual user.

• A. Seat cushion, armrests only.
• B. Motor, battery, casing, wheels.
• C. Frame, drive wheels, caster wheels, seating system, backrest, head/neck support; factors include postural alignment, pressure distribution, skin integrity, endurance, user size, environment, and prognosis.
• D. Backrest only.

Answer: (C)