When the Price of Good X Increases by 20 Percent

Multiple Choice

When the price of good X increases by 20 percent, the quantity demanded of good Y increases by 40 percent. The cross-price elasticity of demand is equal to _____, and these goods are:

A) 0.5; complements.
B) 2; complements.
C) -0.5; substitutes.
D) 2; substitutes.