The economists who estimated India's National Income and Per capita Income are -> the ones listed in option 2 -> which includes Dadabhai Naoroji, William Digby, Findlay Shirras, V.K.R.V. Rao and R.C. Desai.
These economists made individual attempts to measure India's national and per capita income.
Their estimates -> yielded conflicting and inconsistent results -> but were significant in understanding India's economy during the colonial period.
The correct answer is option 2.