What does the primary World Bank collection of development indicators comprise?

The primary World Bank collection of development indicators consists of officially-recognized global development data. This collection provides a comprehensive database that draws on a wide range of sources, including national statistics and reports from various international organizations. These indicators cover critical areas such as economic performance, education, health, and poverty, enabling policymakers, researchers, and the public to analyze and compare development outcomes across different countries over time.

The emphasis on "officially-recognized" highlights the credibility and reliability of the data, as it is often subject to rigorous standards and validation processes before being included in the database. This ensures that users have access to high-quality information that can inform decision-making and policy formulation. The other options do not accurately represent the nature of the World Bank's collection. For instance, relying solely on local sources would limit the comprehensiveness needed for global comparisons, while forecasts and case studies do not form the basis of the primary collection's structure.