The full form of GERI is

Gujarat Energy Research Institute
Gujarat Education Research Institute
Gujarat Engineering Research Institute
Gujarat English Research Institute

The full form of GERI is Gujarat Energy Research Institute. It is a research institute located in Gandhinagar, Gujarat, India. It was established in 1982 by the Government of Gujarat to promote research and development in the field of energy. The institute has a number of research laboratories and facilities, and it conducts research in a variety of areas, including solar energy, wind energy, biomass energy, and energy efficiency. The institute also offers a number of training programs and workshops for professionals in the energy sector.

The other options are incorrect. Option A, Gujarat Education Research Institute, is not a real organization. Option B, Gujarat Engineering Research Institute, is a real organization, but it is located in Ahmedabad, Gujarat, India. Option C, Gujarat English Research Institute, is also not a real organization.