Answer:
The answer is B. It measures changes in prices in a fixed basket of goods.
Step-by-step explanation:
The Consumer Price Index is used to measure whether the prices when up or down. It takes a group {or a basket) of goods and services that is deemed representative. It covers things like food, transportation, clothing. It looks at price changes for each item and average the total to give you an inflation rate. It is calculated monthly, quarterly or yearly.