The correct answer is D. Supply.
In the original pair, “market” is the place where “demand” is met. In other words, the market is where people go to buy the things they need or want. Similarly, “farming” is the activity of producing “supply”. In other words, farming is where food is produced.
A farmer is a person who farms, but they are not the same thing as farming. A farmer is a person who works on a farm, but farming is the activity of working on a farm.
Monsoons are seasonal rains that occur in tropical and subtropical regions. They are not related to farming.
Foodgrain is a type of grain that is used as food. It is not related to farming.