In which month of 2021 was the All India Survey on Migrant Workers under the overall guidance of an Expert Group came into effect?

Correct option is D

The correct answer is (d) April.
 The All India Survey on Migrant Workers was launched in April 2021.
 This survey was initiated by the Labour Bureau, under the Ministry of Labour and Employment, Government of India.
 The survey aims to gather data on the socio-economic conditions of migrant workers in India.
 The data collected will help in formulating policies for the welfare of migrant workers and improving their working conditions.