U.S. GDPa. includes production of foreigners working in the U.S. but excludes production by U.S. residents working in foreign countries.b. excludes production of foreigners working in the U.S. and production by U.S. residents working in foreign countries.c. excludes production of foreigners working in the U.S. but includes production by U.S. residents working in foreign countries.d. includes production of foreigners working in the U.S. and production by U.S. residents working in foreign countries.

The correct answer is letter "A": includes production of foreigners working in the U.S. but excludes production by U.S. residents working in foreign countries.

Explanation:

The Gross Domestic Product or GDP represents the overall market value of all the goods and services a country produces. The GDP measures the size of the economy and it is determined by the following formula:

GDP = C+ G + I + NX

Where:

C = Private consumption

G = Government spending

I = Businesses' capital spending

NX = Net exports (exports-imports)

Labor is part of the GDP as well. It could be included in government spending or capital spending. A nation's labor productivity is the sum of all the labor force production within the country regardless of the nationality of the workers. Citizen's productivity working abroad will be included in the GDP of the country where they work.