Final answer:
Medicare is the U.S. federal health insurance program designed primarily for individuals over 65 and for the disabled. The answer is option C.
Step-by-step explanation:
The nation’s healthcare program that provides coverage primarily for the elderly and disabled is called Medicare. Established in 1965, it covers around 40 million people, including those over the age of 65 and younger individuals with certain disabilities. Medicare is an entitlement program funded through payroll taxes and consists of hospitalization coverage, supplemental coverage, and a prescription drug benefit. It provides crucial support to individuals who may not have access to health insurance through employers or private healthcare plans.