Answer:
The correct answer is A.
The Consumer Price Index (CPI) is a statistical measure that examines the average price of a basket of goods and services that consumers commonly purchase. It is a way of measuring the prices that consumers pay for products, which allows one to see how prices have changed with time. The CPI is widely used as a tool for measuring inflation because it reflects changes in the cost of living for consumers over time. Inflation refers to the rate at which the general level of prices for goods and services is rising, and the CPI is designed to track this trend over time. Therefore, the CPI is directly related to inflation, and it is one of the most widely used indicators of economic performance in many countries.