Concept:GDP measures output within a country, while GNP includes net income earned from abroad.
Explanation:Gross Domestic Product (GDP) is the total value of goods and services produced within a country's borders.
Gross National Product (GNP) is GDP plus net factor income from abroad.
Net factor income from abroad is the difference between income residents earn from overseas and income foreigners earn within the country.
Therefore, GNP = GDP + net factor income from abroad.
This net income is the only factor that separates GDP from GNP.
Answer:C. net factor income from abroad