Answer: c. A large variety of sock styles and sizes at competitive prices.
Step-by-step explanation:
Economies of scale refers to a scenario that arises with companies that operate on a certain scale that makes their cost per unit decrease as they produce more units of a good.
When this happens, such companies can offer more goods at cheaper prices because they have less costs to cover. Knickerboxers Socks has a economies of scale which allows it to produce a large variety of sock styles that it can sell at cheaper competitive prices.