The correct answer is A) Fair price shops.
Fair price shops, also known as ration shops, are government-run stores that sell subsidized food grains to eligible households. They are the main channel through which the government’s food security program is implemented.
Supermarkets, farmer’s markets, and online grocery stores do not sell subsidized food grains.
Supermarkets are privately-owned stores that sell a wide variety of goods, including food. They are not required to sell subsidized food grains.
Farmer’s markets are open-air markets where farmers sell their produce directly to consumers. They are not required to sell subsidized food grains.
Online grocery stores are websites that sell food and other goods. They are not required to sell subsidized food grains.