Higher prices for new textbooks.
Answer: Option C
Step-by-step explanation:
The demand of a good is inversely related to the price of that particular good. If the price of a good increases, the demand of that good will fall. This is known as the law of demand in Economics.
In the above example, with the increase in the prices of the new textbooks, the demand of those textbooks will decrease in the market. As a result if this, the demand curve for the same will shift inwards.