In Order to Prove That Coca Cola and 7-Up Are

Multiple Choice

In order to prove that Coca Cola and 7-Up are substitutes, one should test the _____ and get a _____.​

A) price elasticity of demand; number less than −1
B) income elasticity; positive number
C) cross-price elasticity; negative number
D) price elasticity of demand; number greater than −1
E) cross-price elasticity; positive number