When planning the discharge of a child with juvenile idiopathic arthritis, which intervention should the nurse include in the plan of care to promote joint mobility and reduce pain?

A. Corticosteroid injections are used in severe cases but are not routine for mobility or pain relief in long-term management. B. Hot compresses can provide temporary pain relief but do not address long-term mobility. C. Regular physical activity and exercise are essential to maintain joint mobility, muscle strength, and reduce stiffness in juvenile idiopathic arthritis. D. Limiting movement could lead to joint stiffness and decreased mobility, worsening the condition.