Explanation:

The World Agroforestry Centre (ICRAF), an international research organization dedicated to agroforestry, is headquartered in Nairobi, Kenya. ICRAF conducts research, development, and advocacy on the role of trees in agricultural landscapes and rural livelihoods. Options A, C, and D (Jhansi, Dehradun, and Jodhpur) are locations of significant agricultural or forestry research institutions in India, such as the Indian Grassland and Fodder Research Institute (Jhansi) or the Forest Research Institute (Dehradun), but they are not the headquarters of the World Agroforestry Centre.