You are planning an educational session on osteoporosis to be given at a senior center. Which of the following should be discussed as preventive measures for osteoporosis?

A. Including isometric exercise for at least 30 minutes three times per week: Isometric exercise strengthens muscles but has limited effect on bone density. Weight-bearing and resistance exercises, such as walking or light weightlifting, are more effective in promoting bone formation and maintaining bone strength in older adults. B. Having a yearly dual-energy X-ray absorptiometry (DXA or DEXA) scan: DXA scans are used for diagnosing and monitoring osteoporosis, not for prevention. While regular screening is important for early detection, it does not actively prevent bone loss or improve bone health. C. Following a diet with adequate amounts of calcium and vitamin D: Adequate intake of calcium and vitamin D supports bone mineralization and slows bone resorption. Calcium strengthens the bone matrix, while vitamin D enhances calcium absorption. D. Increasing the intake of beverages containing phosphorus: Excess phosphorus, found in carbonated drinks and processed foods, can disrupt calcium balance and promote bone demineralization. Increasing phosphorus intake may therefore increase the risk of osteoporosis rather than prevent it.