Answer: An economist would explain this by saying there has been a decrease in the quantity supplied of pepperoni rolls and an increase in the supply of pizza. Option D
Explanation: The law of supply states that an increase in price leads to an increase in quantity supplied. We can therefore say that a decrease in price will lead to a decrease in quantity supplied.
Therefore, since there has been a decrease in the price of pepperoni rolls, the manufacturer will produce less and this will lead to a decrease in the quantity supplied of pepperoni rolls and an increase in the supply of pizza.