Answer:
A) quantity demanded of one product divided by the percentage change in the price of another product.
Step-by-step explanation:
cross elasticity of demand = % change in quantity demanded for product A / % change in price of product B
When the cross elasticity of demand related products is negative, both products are complementary to each other, e.g. coffee and sugar, hot dogs and mustard. When the price of coffee increases, the quantity demanded for both coffee and sugar will decrease.
When the cross elasticity is positive, then both products are substitutes, e.g. coffee and tea, Coke and Pepsi. When the price of Pepsi increases, the quantity demanded of Coke increases while the quantity demanded of Pepsi decreases.