Which organization is primarily associated with C40 Cities?

The correct choice is primarily associated with C40 Cities because C40 is a network of the world's megacities committed to addressing climate change and driving urban action that reduces greenhouse gas emissions. The United Nations plays a crucial role in global climate initiatives and partnerships, particularly through programs like the Sustainable Development Goals (SDGs) and the Paris Agreement. C40 aligns its goals with the broader objectives of the United Nations, particularly in promoting sustainable urban development and fostering international cooperation to combat climate change.

The other organizations listed, while influential in their respective areas, do not have the same emphasis on urban climate action as C40 does in relation to cities. The World Health Organization's focus is primarily on public health, the International Monetary Fund deals with economic stability and financial issues, and the World Bank concentrates on economic development and poverty reduction. While these organizations may touch on climate issues, they do not specifically focus on the urban climate initiatives that C40 Cities champions.