The Global Competitiveness Report is published by the World Economic Forum (WEF).

Option A is incorrect. The International Monetary Fund (IMF) primarily focuses on macroeconomic policies, financial stability, and global monetary cooperation, but it does not publish the Global Competitiveness Report.

Option B is incorrect. The United Nations Conference on Trade and Development (UNCTAD) deals with trade, investment, and development issues but is not responsible for this report.

Option C is correct. The World Economic Forum (WEF) releases the Global Competitiveness Report (GCR), which assesses the competitiveness of countries based on various economic indicators such as infrastructure, macroeconomic stability, health, education, market efficiency, and innovation.

Option D is incorrect. The World Bank publishes reports related to economic development, poverty reduction, and business environments, such as the Ease of Doing Business Report, but it does not release the Global Competitiveness Report.