Answer:
d. it is the broadest measure of prices in the economy
Explanation:
GDP price index is used to measure price change of consumer goods and services bought. In addition it measures change in price of goods and services bought by businesses, government, and foreign citizens.
It is the broadest measure of prices in the economy because it takes into consideration all goods and services in the economy.
GDP price index for example is different from Consumer Price Index that only measures changes in price for goods and services of consumer goods.