Answer:
The correct answer is option D.
Explanation:
A decrease in supply refers to the situation when there is a leftward shift in the supply curve due to a change in a variable other than the price of the product.
An increase in the supply, on the other hand, is indicated by a rightward shift in the supply curve.
A change in the price of the product causes the quantity supplied of the product to change. It is indicated by a movement on the same supply curve.
The other factors that affect the overall supply of a product are the cost of production, level of technology, price of related goods, tax and subsidies.