The correct option is D R. C. Dutt
While all the above members were all moderates of the Indian National Congress, only Dadabhai Naoroji and R. C. Dutt figured out the systematic drainage of Indian resources by the Britishers, by limiting exports and increasing imports. All this was documented and called this Drain Theory. The theory laid by Naoroji observed six factors for the drain of wealth: India being a colony paid for the administration, development without good returns, and that India as a region did not attract foreign labour for economic growth to name a few.