The correct answer is (b). The All India Trade Union Congress (AITUC) was established in 1919. It is the oldest trade union federation in India. It was founded by Lala Lajpat Rai, Mahatma Gandhi, and other leaders of the Indian independence movement. The AITUC is affiliated to the International Trade Union Confederation (ITUC). It has a membership of over 10 million workers. The AITUC is a powerful force in the Indian labor movement. It has played a major role in the struggle for workers’ rights in India.
Option (a) is incorrect because the AITUC was established in 1919, not 1920.
Option (c) is incorrect because the AITUC was established in 1919, not 1922.
Option (d) is incorrect because the AITUC was established in 1919, not 1924.