Questions: To calculate GDP by the expenditure method one must add consumption spending, investment spending, government purchases, and net exports.

The answer is D: consumption spending, investment spending, government purchases, and net exports.

Explanation for each option:

A. Wages, rents, interest, and profits - This option describes the income approach to calculating GDP, not the expenditure method. The income approach sums up all the incomes earned in the production of goods and services, including wages, rents, interest, and profits.

B. Consumption spending, investment spending, government purchases, and exports - This option is close but incorrect because it does not account for imports. In the expenditure method, net exports (exports minus imports) are considered, not just exports.

C. Labor, natural resources, entrepreneurship, and capital - This option refers to the factors of production, which are inputs used to produce goods and services, not components of GDP calculation by the expenditure method.

D. Consumption spending, investment spending, government purchases, and net exports - This is the correct answer. The expenditure method calculates GDP by summing up consumption spending, investment spending, government purchases, and net exports (exports minus imports). This method reflects the total spending on a country's final goods and services in a given period.