A 5-year-old child has severe extensor tone and shortened hamstrings secondary to athetoid cerebral palsy. The child typically pushes into extension when in a seated position in the wheelchair, making it difficult for the parents to position the child for feeding. Which method should the OTR advise the parents to use INITIALLY to stabilize the child in the wheelchair?
a) Insert a small roll behind the lumbar spine to promote an anterior pelvic tilt.
b) Insert a wedge cushion in the chair seat to raise the distal portion of the thighs approximately 3 inches (7.62 cm) higher.
c) Place the feet on the footrests with the knees positioned in less than 90° of flexion to pull the ischial tuberosities into a posterior pelvic tilt.
d) Secure a lap belt at a 45° angle across the child's hips to stabilize the pelvis.