The correct answer is (d), Jodhpur.
The Desert Plantation and Research Centre is located in Jodhpur, Rajasthan, India. It was established in 1962 by the Indian Council of Agricultural Research (ICAR) to conduct research on the cultivation of plants in arid and semi-arid regions. The centre has developed a number of drought-tolerant varieties of crops, including wheat, barley, millet, and pulses. It also conducts research on the management of water resources and the development of sustainable agricultural practices.
The other options are incorrect. Jaipur is the capital of Rajasthan and is located in the eastern part of the state. Kota is a city in the eastern part of Rajasthan. Jhalawar is a city in the southeastern part of Rajasthan.