Which of the Following Best Explains 'Price Elasticity

Multiple Choice

Which of the following best explains 'price elasticity'? 

A)  Discount is based on a special offer to temporarily stimulate sales. 
B)  Discount is based on orders placed out of season for delivery later in the year. 
C)  Discount is based on the how fast the customer pays their bills. 
D)  The extent to which price per unit changes with the volume that is purchased.