Health maintenance organizations primarily aim to generate profit by?

Health maintenance organizations (HMOs) primarily focus on keeping people healthy as part of their business model. This preventive approach not only improves health outcomes for their members but also reduces overall healthcare costs. By investing in preventive care and wellness programs, HMOs aim to minimize the need for more expensive acute care services that arise from untreated health issues. Keeping members healthy aligns with the HMO's goal of managing healthcare expenses effectively, thereby enhancing their profitability while providing value to patients.

In contrast, other options either reflect traditional fee-for-service payment structures, which are not often emphasized by HMOs, or suggest limiting care inappropriately. Therefore, the emphasis on preventive care and maintaining overall health directly supports the strategic objectives of HMOs, making it the most suitable choice.