The correct option is C Mandal Commission, 1978
"The Janata Dal party led by V P Singh focussed on providing opportunities for the people of backward communities.
In 1978, the Central Government appointed the Mandal Commission to investigate the extent of educational and social backwardness among various sections of Indian society, and recommend ways of identifying these ‘backward classes’. The commission undertook a survey and recommended reserving 27 per cent of seats in educational institutions and government jobs for these groups."