Consider the following statements regarding pre-independence national income estimates in India: 1. William Digby's estimate of per capita income was lower than that of Dadabhai Naoroji. 2. Shah and Khambata estimated India's national income for the period 1900-1914 using a highly scientific double-entry bookkeeping method. 3. Findley Shirras estimated the national income for 1921 and 1922, showing a significant increase in nominal per capita income compared to Naoroji's estimate. Which of the statements given above are correct?
Options:
- A: 1 and 2 only
- B: 1 and 3 only
- C: 2 and 3 only
- D: 1, 2 and 3
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