Final answer:
GDP is the value of the output of all goods and services produced within a country in a year. The synonyms of GDP are income, output, total spending, and the level of economic activity.
Step-by-step explanation:
Gross Domestic Product (GDP) is the value of the output of all goods and services produced within a country in a year. It is a measure of the total economic activity in a country.
The synonyms of GDP are income, output, total spending, and the level of economic activity. Therefore, all of the options given in the question are actually synonyms of GDP.