Answer: a. Generic goods
Explanation: generic goods are products that have very basic packaging with no brand name, are backed with little or no advertising, and typically have prices much lower than branded products. Sometimes they may be produced in the same production plant as name-brand products, or they may be produced by lesser-known manufacturers. Generic goods are usually popular during recessions as they are designed to be substitutes for brand named goods and also due to their low prices which is a direct result of little to no promotion (which push up prices), more efficient production processes that avoid costs.