A nurse is teaching a client who has Multiple Sclerosis about factors that can worsen their manifestations. Which of the following factors should the nurse include in the teaching?

A. Sunbathing: Exposure to heat, including sunlight or hot environments, can exacerbate multiple sclerosis (MS) symptoms due to impaired nerve conduction in demyelinated neurons. Even a small increase in body temperature can temporarily worsen fatigue, weakness, or visual disturbances, a phenomenon known as Uhthoff’s phenomenon. Clients with MS are advised to avoid prolonged sun exposure or take protective measures. B. Flying: Flying at commercial cabin altitudes generally does not cause symptom exacerbation in MS. While changes in cabin pressure or mild hypoxia are possible, they are typically well tolerated, making this a less significant factor in triggering manifestations. C. High altitude travel: High altitudes may lead to reduced oxygen availability, but short-term exposure rarely worsens MS symptoms. Unless accompanied by heat or dehydration, high-altitude travel is not a common trigger for acute exacerbations. D. Working in an office: Office work does not inherently expose clients to heat or other physiological stressors that trigger symptom worsening. Routine occupational environments are generally safe and do not contribute significantly to exacerbations of MS manifestations.