Which of the following is a role of Customs and Border Protection?

The role of Customs and Border Protection (CBP) prominently includes inspections of customs and immigration. This function is critical to the agency's mission of safeguarding America's borders while facilitating legitimate trade and travel. CBP is responsible for enforcing U.S. laws related to immigration and customs, which involves inspecting people and goods entering the country to ensure compliance with regulatory requirements. This not only includes identifying potential threats but also ensuring that all items comply with trade laws and regulations.

In contrast, the other options pertain to different areas of regulatory oversight. Managing food safety regulations is typically handled by the Food and Drug Administration (FDA) and the U.S. Department of Agriculture (USDA). Setting transportation rates is generally within the purview of transportation agencies or individual companies, not a border protection agency. Environmental compliance is mainly managed by the Environmental Protection Agency (EPA). Therefore, inspections of customs and immigration accurately describe a fundamental aspect of what CBP does.