A school nurse is screening an 11-year-old child for idiopathic scoliosis. Which of the following instructions should the nurse give the child for this examination?

A. Turning to the side in a relaxed position does not allow proper visualization of spinal curvature. B. Lying prone on the examination table prevents assessment of asymmetry in the rib cage or spine. C. Bending forward from the waist with head and arms downward is the correct position for scoliosis screening, allowing the nurse to observe for rib hump or asymmetry. D. Flexing and extending the neck does not help in identifying scoliosis.