Final answer:
The GNP includes the value of final goods and services produced by a nation's citizens and firms worldwide. This means that option b, 'Final goods and services produced in other countries by US firms', is included in the US GNP.
Step-by-step explanation:
The Gross National Product (GNP) is a measure of a country's economic performance. Unlike Gross Domestic Product (GDP), which accounts for value generated within a country's borders, GNP includes the output produced by the citizens and businesses of a country regardless of where they are located. Therefore, GNP would include final goods and services produced by domestic businesses and labor abroad, while also subtracting any income that foreigners earn within the country and send back to their home countries.
Answering the student's question, option b, 'Final goods and services produced in other countries by US firms' would be included in the United States' GNP. This encompasses the activities of US citizens and businesses no matter where they operate globally. The distinction between GNP and GDP is pivotal, as GDP would not account for overseas production by domestic entities or subtract the incomes sent back by foreign entities within a nation.