The correct answer is (a) Deewan Chaman Lal.
Deewan Chaman Lal was a prominent Indian trade unionist and politician. He was the first President of the All India Trade Union Congress (AITUC), which was founded in 1920. He was also a member of the Indian National Congress and served as a member of the Legislative Assembly of the United Provinces.
Lala Lajpat Rai was a prominent Indian nationalist, freedom fighter, and social reformer. He was a member of the Indian National Congress and served as a member of the Legislative Assembly of Punjab. He was also a founder of the Arya Samaj, a Hindu reform movement.
Jawaharlal Nehru was the first Prime Minister of India. He was a member of the Indian National Congress and served as President of the party from 1929 to 1930. He was also a member of the Constituent Assembly of India, which drafted the Constitution of India.
C.R. Das was a prominent Indian nationalist, freedom fighter, and lawyer. He was a member of the Indian National Congress and served as President of the party from 1922 to 1923. He was also a founder of the Swaraj Party, a political party that advocated for swaraj, or self-rule, for India.