What was the primary methodological limitation of Dadabhai Naoroji's estimation of India's national income for 1867-68?

Options:

• A: He completely ignored the agricultural sector and focused only on industrial output.
• B: He did not calculate the per capita income and only provided the aggregate national income.
• C: He calculated the value of physical goods (agriculture and some industry) but largely omitted the services sector.
• D: He relied entirely on British tax records without verifying the actual production levels.

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