The correct option is B
In macroeconomics, the gross domestic product (GDP), also known as gross domestic product or gross domestic product (GDP), is a macroeconomic magnitude that expresses the monetary value of the production of goods and services of final demand of a country or region during a specific period, usually one year.
The GDP is used as an object of study of macroeconomics. Its calculation falls within the national accounting. For its estimation, several complementary approaches are used. After the relevant adjustment of the results obtained, partially, the submerged economy is included in its calculation.