Correct Answer: Investment spending

Solution : The correct answer is d) Investment spending.

Gross Domestic Product (GDP) is a measure of the total value of all goods and services produced within a country's borders during a specific time period. It is a comprehensive measure of economic activity within an economy.

Investment spending, which includes business investment in machinery, equipment, structures, and inventory, is indeed included in the calculation of GDP. Investment spending represents spending on the creation of new capital goods and contributes to the overall economic output.