in reference to the graph, which of the following statements is correct? a. the demand curve is less elastic when the price increases from $4 to $6 than when it increases from $6 to $8. b. the demand curve is more elastic when the price increases from $4 to $6 than when it increases from $6 to $8. c. the demand curve is unit-elastic when the price increases from $4 to $6 and when it increases from $6 to $8. d. the demand curve has the same elasticity when the price increases from $4 to $6 as when it increases from $6 to $8. e. the demand curve is the least elastic near the price of $10 and the most elastic near the price of $4.