Answer:
National income
Explanation:
Income method of gross domestic product (GDP) measurement is focused onto the accounting fact that almost all economic spending should be equivalent to the amount of revenue earned by the output of all consumer products and services.
This method also supposes that an economy has 4 major production determinants and all earnings must go to any of these 4 sources. Thus a simple calculation of the gross tangible value of commerce over a span could be made by combining all revenue sources.
Thus, from the above we can conclude that the correct option is C.