Correct Answer: Gross Domestic Product (GDP)

Solution : The correct answer is (a) Gross Domestic Product (GDP).

The sum of consumption, investment, government expenditure, and net exports is equal to Gross Domestic Product (GDP). GDP is a measure of the total value of all final goods and services produced within a country's borders in a given period, typically a year.

The components of GDP are as follows:

1. Consumption: It represents the spending by households on goods and services for personal use.

2. Investment: It refers to the spending by businesses on capital goods, such as machinery, equipment, and structures, to increase productive capacity or generate future economic benefits.

3. Government expenditure: It represents the spending by the government on goods, services, and public infrastructure.

4. Net exports: It is the difference between the value of exports and imports, reflecting the trade balance of a country.

By adding these components together, we obtain the total value of all goods and services produced in an economy, which is the Gross Domestic Product (GDP).