This might be help full for your question. I think .
Answer:
The answer is C. An issue of private law as opposed to an issue of federal law.
Explanation:
The answer is a lower-priced brand of coffee a substitute goods is the type of goods that customers could use as a replacement for other similar products.In this particular case, if the customers do not have enough purchasing power to buy the expensive coffee, they could replace the choice with the cheaper one that exist within their price range.
PS i love your profile pic