Refer to the figure below. When the price is equal to 8, the price elasticity of demand for the demand curve D1 is _ and for D2 the price elasticity of demand is _.

Refer to the figure below. When the price is equal to 8, the price elasticity of demand for the demand curve D1 is _ and for D2 the price elasticity of demand is _.
A.2; 4
B.4; 1
C.4; 4
D.1; 4
正确答案：1; 4