Relate to the Following:
a Firm Is Producing Two Goods $$Q _ { \boldsymbol { d } } = 120 - 4 P _ { x } - 10 P _ { y }$$

Multiple Choice

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

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