Is the social cost of supplying a good or service us higher that private cost With explanation

3. If the social cost of supplying a good or service is higher than the private cost, then A) the production of the good or service should be subsidised B) the price of the good or service is too low in the private market equilibrium C) the price of the good or service is too high in the private market equilibrium D) the good or service is a public good