A Firm Is Producing Two Goods (X and Y)that Are $$Q _ { d } = 120 - 4 P _ { x } - 10 P _ { y }$$

Multiple Choice

A firm is producing two goods (X and Y) that are related in consumption.The demand function for X is: $$Q _ { d } = 120 - 4 P _ { x } - 10 P _ { y }$$ Which of the following pairs of goods might the firm be producing?

A) cars and gasoline
B) cola and caffeine-free coke
C) newspapers and tennis balls
D) bran cereal and sugar-frosted corn flakes
E) both b and d