Final answer:
Option c. Department of Commerce is the US federal government department that provides comprehensive information about export opportunities, including the regulation of trade policies and import quotas.
Step-by-step explanation:
The department of the US federal government that provides the most all-inclusive source of information regarding export opportunities is the Department of Commerce. This department is responsible for a broad range of activities that affect trade policy, including the imposition of import quotas and determining instances of import dumping by other countries. If the United States International Trade Commission, a government agency, finds that such dumping has substantially injured domestic industries, the president can impose tariffs to offset the unfairly low price.