Answer:
A) It will increase now because the tax on imported grains will increase the future price of grains.
Step-by-step explanation:
Consumer expectations can shift the demand curve to the left or to the right. If consumers believe that the price of a good will increase in the future, the demand curve will shift to the right increasing the quantity demanded at every price level. This happens because consumers expect, or know in this case, that the price for the goods will increase in the future, so they will stock themselves with as much as they can before the price increases. E.g. you expect the price of cars to increase because of a new tax, so you might purchase a new car immediately instead of waiting 6 more months.