Which of the goods or services listed below fits into the category where there is genuine disagreement regarding whether the item is a merit good or a merit bad and whether it should be available to people who want it?

a. Medicaid

B. The Women, Infants, and Children (WIC) Supplemental Nutrition Program

C. Reduced price bus fares in Brevard County for riders with a Medicare card

D. Methadone treatment centers for heroin addicts