The correct answer is:

1, 2, and 3

All three individuals mentioned - Dadabhai Naoroji, G. Subramania Iyer, and R. C. Dutt - were notable economic critics of colonialism in India. Dadabhai Naoroji is often referred to as the "Grand Old Man of India" and was a prominent figure in the Indian National Congress. He wrote extensively on the economic exploitation of India by the British and was a strong advocate for economic reforms. G. Subramania Iyer, an Indian lawyer and politician, criticized the economic policies of the British Raj and advocated for self-sufficiency and industrial development in India. R. C. Dutt was an economist, historian, and writer who extensively analyzed the economic impact of British colonialism on India in his book "The Economic History of India."