Rajiv Gandhi National Ground Water Training and Research Institute is located at :

The correct answer is (a) Bhopal.

The Rajiv Gandhi National Ground Water Training and Research Institute (RGNGTRI) is a national institute of the Ministry of Water Resources, River Development and Ganga Rejuvenation, Government of India. It is located in Bhopal, Madhya Pradesh. The institute was established in 1986 with the objective of providing training and research facilities in the field of ground water. It offers a variety of courses and programs at the diploma, graduate, and postgraduate levels. The institute also conducts research in various areas of ground water, such as hydrogeology, water quality, and artificial recharge.

The other options are incorrect because:

• Lucknow is the capital of Uttar Pradesh.
• Raipur is the capital of Chhattisgarh.
• Dehradun is the capital of Uttarakhand.