Answer:
The correct answer would be option D, Multiply all goods, services and structures produced inside our national boundaries in a 12 month period by their prices, and then add them up.
Step-by-step explanation:
GDP stands for Gross Domestic Product, which is the final value of all products, services and structure that are produced within the country. In simple words we can say that the value of all finished products and services produced in a country within a period of one year is called as GDP.
So in the given question, the most appropriate option would be option D, which is when the prices of goods, services and structures produced are multiplied, which are produced inside the national boundaries within a 12 month period, it is called as GDP.