The price elasticity of demand is equal to the​ ________ in the​ ________ divided by the​ ________ in the​ ________.

a. ​change; price;​ change; quantity demanded

b. percentage​ change; quantity​ demanded; percentage​ change; price

c. percentage​ change; price; percentage​ change; quantity demanded

d. ​change; quantity​ demanded; change; price