What is required when a commodity must be free from pests according to the USDA standards?

The requirement that a commodity must be free from pests according to USDA standards emphasizes a proactive approach to pest management and quality assurance. This involves ensuring the commodity undergoes specific steps, including comprehensive monitoring and treatments that help guarantee that it is free of pests before it can be transported or sold.

Step 4 typically refers to action taken during the pest management process, which would include rigorous methods to assess and treat commodities. This continuous monitoring and treating process is crucial because it ensures that any potential pests are identified and managed effectively, thereby reducing the risk of pest transmission across borders and to other agricultural areas. This aligns with the USDA's goal of safeguarding plant health and preventing pest outbreaks.

While other choices mention related aspects of pest management, they do not encompass the complete set of procedures and ongoing oversight necessary for ensuring a commodity is pest-free. Instead, choice B captures the comprehensive nature of these standards and highlights the importance of ongoing vigilance in pest control and treatment efforts.