What is the lowest grade of eggs that can legally be sold in stores?

The correct response is that Grade A eggs are the minimum quality that can be legally sold in stores. These eggs must meet specific standards set by the United States Department of Agriculture (USDA), which include criteria for shell quality, air cell size, and the appearance of the egg's contents. Grade A eggs have a clean, uncracked shell, a firm white, and a yolk that is round and firm. This ensures that they are suitable for consumer purchase and use.

In contrast, Grade B and Grade C eggs do not meet the necessary quality standards for retail sale. Grade B eggs typically have thinner whites and more noticeable defects, making them suitable only for use in processed products or for industrial purposes. Therefore, the legal sale of eggs intended for direct consumer purchase begins at Grade A, ensuring that consumers receive a product that is safe, fresh, and of acceptable quality.