Which Is the Most Accurate Statement About the CPI

Which is the most accurate statement about the CPI?

A) When the CPI increases, the average family has to spend less to maintain its standard of living
B) When the CPI increases, the average family has to spend more to maintain its standard of living
C) When the CPI increases, the standard of living of the average family increases
D) The CPI has nothing to do with the average family's standard of living