Which is the main sources of employment in India?

Option a is correct as according to Census 2011, agriculture and its allied areas like animal husbandry, fisheries etc provide employment to 48.9% of the total working population. This makes agriculture the main source of employment in India.

Option b is incorrect as according to Census 2011, industry provides employment to 22% of the total working population.

Option c is incorrect as according to Census 2011, Service sector provides employment to 27% of the total working population.

Option d is incorrect as the word ‘livestock’ is not related to employment matters.