C. gross domestic product (GDP)
Explanation:
A gross domestic perfection is a rate that is used to tell whether a country's economy is rising or falling and his measure tells exactly in the consumption and the spending power of the nations. As the measure of the economic growth the GDP is a sum of the total pr annual product that takes place in the country during that period. And gives a market value of all the produce either good and the services. The GDP can be calculated as GDP = private consumption + gross investment + government investment + government spending + (exports – imports).