Explanation:

Gross National Income (GNI)
GNI is the total amount of money earned by a nation's people and businesses. It is used to measure and track a nation's wealth from year to year. The number includes the nation's gross domestic product plus the income it receives from overseas sources.
GNI is an alternative to gross domestic product (GDP) as a means of measuring and tracking a nation's wealth and is considered a more accurate indicator for some nations.
Understanding GNI
GNI calculates the total income earned by a nation's people and businesses, including investment income, regardless of where it was earned. It also covers money received from abroad such as foreign investment and economic development aid.
GDP is the total market value of all finished goods and services produced within a country in a set time period. Hence, option (c) is correct.
GNI is the total income received by the country from its residents and businesses regardless of whether they are located in the country or abroad.
GNP includes the income of all of a country's residents and businesses whether it flows back to the country or is spent abroad. It also adds subsidies and taxes from foreign sources.
Converting GDP to GNI
To convert a nation’s GDP to GNI, three terms need to be added to the former:
1) Foreign income paid to resident employees,
2) Foreign income paid to residential property owners and investors, and
3) net taxes minus subsidies receivable on production and imports.