Supplemental Insurance is used for which of the following?

Supplemental insurance is designed to fill in gaps left by a primary insurance policy. It provides coverage for services and expenses that are not typically covered, or are partially covered, by a primary health insurance plan. This can include services such as dental care, vision care, or certain critical illness coverages, which may not be included in standard health plans.

While some supplemental plans can provide cash payouts for specific events, like hospitalization, this is not their primary purpose. The focus of supplemental insurance is more about enhancing coverage for services that lead to out-of-pocket expenses or that are outside of the standard offering of health insurance. Free preventive care services are generally covered by many primary health plans as part of preventive care benefits, so they don't fall under supplemental coverage. Therefore, the choice that accurately describes the purpose of supplemental insurance is the one that details its role in covering services not normally covered by a primary plan.