This question asks for the INCORRECT statement. Options A, B, and C are all correct formulas: GDP at market price = GDP at factor cost + net indirect taxes; NNP at factor cost = NNP at market prices - net indirect taxes; GNP at market prices = GDP at market prices + net factor income from abroad. Since all A, B, and C are correct, option D 'None of the above' (meaning none are incorrect) is the right answer.