Correct option is C
The full form of the acronym C.I.E.T. in the context of education in India is
(c) Central Institute of Educational Technology.
C.I.E.T. is a constituent unit of the National Council of Educational Research and Training (NCERT). It plays a significant role in developing and disseminating educational technologies to improve the quality of school education across the country. The institute focuses on utilizing various media and technology-based interventions to enhance teaching and learning processes.