Final answer:
Medicare typically reimburses medical expenses through Part A and Part B, with coverage varying depending on the service and plan.
Step-by-step explanation:
Medicare typically reimburses medical expenses through Part A and Part B. Part A pays a portion of hospital charges and is funded by payroll deductions. Part B covers healthcare costs outside of hospital stays and requires participants to pay a monthly fee, deductibles, and copayments. The government contributes a portion of the overall costs. Therefore, the correct answer is D) It varies depending on the service and plan.