Step 1: Analyze economic features of colonial India.
During the British colonial period, India experienced very low growth in per capita income, particularly between 1920–47 due to recurring famines, wars, and stagnation.
Step 2: Verify each statement.
(A) Correct — Growth of per capita income was indeed lower in 1920–47 compared to earlier decades.
(B) Correct — Land revenue was the main source of colonial fiscal income.
(C) Correct — Railway investment was financed through British capital, but interest payments were borne by Indian revenues.
(D) Correct — Dadabhai Naoroji’s “Drain Theory” included home charges, interest payments, pensions, and other remittances to England.
Step 3: Conclusion.
All the given statements are correct.