Answer:
The correct answer is - D. supply decreases.
Step-by-step explanation:
If any ingredient or factor can affect the production of the good or service by changing its price then the final price of the product will also change. In this case, the cost of fertilizer rises then the price of wheat also be increase as it is a key factor for the production of wheat.
This increase in price will lead to decreases in the demand in the market. As the law of demand and supply states, here also decrease in demand will lead to a decrease in the supply as well.