Explanation:

The World Meteorological Organization (WMO) is a specialized agency of the United Nations responsible for promoting international cooperation on atmospheric science, climatology, hydrology, and geophysics. Its headquarters are indeed located in Geneva, Switzerland. Option (A) Tokyo is home to the United Nations University (UNU), not the WMO. Option (B) Sydney is a major city in Australia but does not host the WMO headquarters. Option (D) Washington D.C. is the capital of the United States and hosts various international organizations like the World Bank and the International Monetary Fund, but not the WMO. Therefore, Geneva is the correct location for the WMO headquarters.