The price elasticity of demand is a units-free measure of the responsiveness of __ A. the demand for a good when the price of one of it substitutes or a complement of it changes B. the quantity demanded of a good to a change in its price when all other influences on buying plans remain the same C. the demand for a good when consumers income changes D. the quantity demanded of a good to a change in the quantity supplied when all other influences on buying,plans remain the same The price elasticity of demand is calculated by dividing the __ by the __ A. percentage change in the quantity demanded; percentage change in the price B. change in the quantity demanded; change in the price C. percentage change in the price; percentage change in the quantity demanded D. change in the price; the change in the quantity demanded