According to Census-2011 the sex-ratio of India is :

Sex ratio is a standard demographic measure — the number of females per 1000 males in a given population — reported by the Census of India for the country as a whole and separately for every state, union territory, and age group (e.g., the 0-6 years “child sex ratio”).

For Census-2011, the provisional national sex-ratio figure released on 19 March 2013 — the figure used in contemporaneous 2013 study and coaching material for this exam — was 940 females per 1000 males, up from 933 in Census-2001. The final figure released later that year revised this slightly to 943; but among the four values offered here, 940:1000 is the one that matches an officially reported all-India Census-2011 sex-ratio statistic.

• 916:1000 and 920:1000 read like individual state-level Census-2011 sex-ratio figures, not the all-India statistic the question asks for.

• 982:1000 falls in the range reported only for a handful of individual states/union territories with comparatively high female representation in Census-2011 — again a state-level rather than a national figure.