In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".

[header] How to buy natural beef [title] Know about regional certifications for food. [step] One of the first steps in buying natural beef is knowing what the labels on your food mean. These labels, and the meanings behind them, vary from country to country. <sep> (A) [substeps] Regional certifications are commonly performed by specialty food producers in countries similar to the united states. You will need the appropriate holiday agency, or regional psychologists for certain food brands you buy from, to buy one. (B) Check out some websites like international food-and-agriculture advisory. Keep in mind, however, that any animal listed on the label is legal to sell. (C) Knowing what they mean will help you decide on foods that you plan to grow in the future. [substeps] The united states association of food nutrition scientists (csa) has also compiled a list of pet foods that are natural based. (D) Understand how your country labels food in order to buy the best and most natural products on the commercial market. [substeps] In the end, food that is sold in commercial markets is only as good as the actual regulations enforced by the countries in which they are sold.
D