Which of the following is NOT a source of trade statistics?

The correct choice highlights that the World Health Organization (WHO) Reports are not a source of trade statistics. While the WHO provides a wealth of data related to global health and disease statistics, its focus is primarily on health issues, policies, and interventions rather than on trade data.

In contrast, options such as U.S. Trade Online, UN Commodity Trade Statistics Database, and Piers and Datamyne are all essential sources that compile and provide detailed data on trade transactions. U.S. Trade Online offers comprehensive trade statistics for U.S. exports and imports, the UN Commodity Trade Statistics Database provides international trade data collected from national customs authorities, and Piers and Datamyne specialize in trade data analysis through shipping manifests and various trade databases. These sources are integral to the understanding of international trade flows, making option D a clear outlier among the given choices.