Option 1 -> Incorrect sequence - starts with calculating domestic income before identifying units.
Option 2 -> Incorrect sequence - estimates factor income before identifying the units.
Option 3 -> Incorrect sequence - adds net factor income from abroad before calculating domestic factor income.
Option 4 -> Correct logical sequence following the income method steps.
Hence, Option 4: (C), (B), (D), (A) -> The income method follows a systematic approach: First, identify and classify income generating units like households, firms, government (C). Second, estimate factor incomes (wages, rent, interest, profit) paid by each sector (B). Third, sum all factor incomes to calculate domestic factor income (D). Finally, add net factor income from abroad (NFIA = factor income from abroad - factor income to abroad) to arrive at National Income (A). This sequence ensures proper computation: NI = Domestic Factor Income + NFIA. -> correct