Final answer:
The most popular grade of fresh beef commonly sold in restaurants and retail outlets is Choice, known for its quality and affordability.
Step-by-step explanation:
The most popular grade of fresh beef commonly sold in restaurants and retail outlets is Choice. This grade is well-regarded for its quality and affordability, which makes it a common selection for both restaurateurs and consumers. It strikes a balance between the high quality and marbling of Prime beef, which is often featured in upscale restaurants and steakhouses, and the more economical Select grade, which tends to have less marbling. The Standard grade of beef is less common and typically used in processed or value-added products.