Final Answer:
The food that does not require a nutrition label in the United States is d. fresh spinach.
Step-by-step explanation:
According to the U.S. Food and Drug Administration (FDA) regulations, single-ingredient foods, such as fresh produce like spinach, are exempt from mandatory nutrition labeling. This exemption is based on the assumption that these foods are inherently nutritious and do not undergo processing that significantly alters their nutritional content. Therefore, fresh spinach, being a single-ingredient, unprocessed food, is not required to have a nutrition label.
The FDA mandates nutrition labeling for most packaged and processed foods to provide consumers with essential information about the product's nutritional content. However, whole, raw fruits, vegetables, and certain other single-ingredient foods are exceptions. These foods are generally considered to be nutritionally straightforward, and consumers are encouraged to incorporate them into a balanced diet without the need for detailed nutrition information.
In summary, fresh spinach, being a single-ingredient, whole food, falls into the category of items exempt from mandatory nutrition labeling according to FDA regulations. This exemption helps streamline the labeling requirements for foods that are inherently nutritious in their natural state.