Which of the following is a benefit of enrolling in Medicare Part D?

Enrolling in Medicare Part D is specifically designed to provide prescription drug coverage to beneficiaries. This program helps individuals with Medicare afford their medications, making it easier for them to access necessary treatments and maintain their health. Since prescription drugs can be a significant cost for many, Medicare Part D plays a critical role in reducing these expenses and improving individuals' overall well-being.

The other options listed pertain to benefits that are associated with different parts of Medicare. For example, preventive services are covered under Medicare Part B, which focuses on medically necessary services and preventive care. Nursing home care falls under Medicare Part A or long-term care, which has different eligibility requirements and coverage specifics. Partial hospitalization is also a service governed by different Medicare rules and is not a benefit of Part D. Therefore, the clear advantage of enrolling in Medicare Part D is its dedicated focus on providing drug coverage, setting it apart from other parts of Medicare.