Is a required deduction A. Health insurance B. Disability C. Medicaid D. Medicare?

The correct answer is D: Medicare. Medicare is a required deduction for most working Americans. It is a social insurance program that provides health coverage to people aged 65 and older, as well as to people with certain disabilities and those with End-Stage Renal Disease (ESRD). Medicare is funded through payroll taxes, which are automatically deducted from workers' paychecks.