Correct Answer: Consumer Price Index (CPI)

Solution : The correct answer is (d) Consumer Price Index (CPI)

The Consumer Price Index (CPI) is not a measure of national income. It is a measure of inflation and is used to track changes in the prices of a basket of goods and services commonly consumed by households. On the other hand, Gross Domestic Product (GDP), Gross National Product (GNP), and Net Domestic Product (NDP) are all measures of national income, which capture the value of goods and services produced within a country's borders during a specific time period.