What is the quality grade of all eggs sold in stores?

Eggs sold in stores are typically graded as Grade A, which is the standard for retail markets. This grade ensures that the eggs have a clean, uncracked shell, a firm white, and a well-defined yolk. The appearance and quality of Grade A eggs make them suitable for consumers looking for high-quality products for cooking or baking.

Grade AA eggs are of even higher quality but are less common in retail settings. They have stricter standards for freshness and appearance, but Grade A is widely accepted and recognized as the standard level for supermarket sales. Grade B and Grade C eggs do exist, but they are generally used for processing rather than being sold directly in stores due to their less desirable quality characteristics.

In summary, Grade A eggs meet the necessary criteria for freshness and quality that consumers expect when purchasing eggs at retail locations, making it the correct choice for this question.