Final answer:
The USDA uses the ratio of meat to bone as a factor to grade poultry, which indicates the amount of edible meat and affects the quality and market value of the product. The correct answer is options C.
Step-by-step explanation:
The United States Department of Agriculture (USDA) grades poultry based on several quality factors, but when we look at the available options, C. Ratio of meat to bone is a factor that the USDA uses to grade poultry. Factors like cholesterol content, height, and age are not specifically used for USDA grading purposes. The meat-to-bone ratio is important as it reflects the amount of edible meat that the poultry offers, which is directly related to its overall value and quality in the market.
The USDA uses a detailed set of guidelines to assess aspects such as the meat's texture, the presence of defects, and the amount of flesh in relation to bone to determine the grade, which can range from Grade A to Grade C. A higher grade indicates a higher quality product that is more desirable for consumers.