Which statement is an objection of using the Consumer Price Index (CPI) to measure changes in the cost of living

Complete Question:

Which of the following is an objection of using the Consumer Price Index (CPI) to measure changes in the cost of living?

A. The calculated inflation rate is only accurate for an individual who purchases all the goods and services in the basket.

B. The inflation rate is always understated due to substitution bias.

Consumer Price Index (CPI)

A. The calculated inflation rate is only accurate for an individual who purchases all the goods and services in the basket.

Explanation:

To obtain the Consumer Price Index (CPI), a predetermined basket of consumer goods and services is obtained.  Weights are assigned to the goods according to their relative values in the basket.  The price changes are calculated.  The resulting figures  are averaged to determine the CPI.

im thinking a but im not 100% sure

explanation:

answer; rapid growth in buyer demand and high buyer switching cost;