The correct option is B They get wasted.
Every year, the government prescribes a certain quantity of foodgrains which is to be procured from farmers. This is called the buffer norm. When the Food Corporation of India collects more than the prescribed quantity, there is a pile-up of massive stocks of foodgrains. Since the foodgrains have a short shelf life, they get ruined after a while. This leads to the wastage of foodgrains.