Figure: the Market for E-Books

Figure: The Market for e-Books
(Figure: The Market for e-Books) Look at the figure The Market for e-Books.Which of the following statements is correct?
A.The demand schedule is less elastic when the price increases from $4 to $6 than when it increases from $6 to $8.
B.The demand schedule is more elastic when the price increases from $4 to $6 than when it increases from $6 to $8.
C.The demand schedule has the same elasticity when the price increases from $4 to $6 as when it increases from $6 to $8.
D.The demand schedule is unit-elastic when the price increases from $4 to $6 and when it increases from $6 to $8.