Which of the Following Statements Is False

Which of the following statements is false?

A) The consumer price index understates changes in the cost of living.
B) The chain index for GDP overstates actual changes in prices.
C) The best overall indicator of inflationary pressures in the economy is the GDP price index.
D) One problem with any fixed- bundle index as a measure of the cost of living is that it does not account for substitutions that consumers might make in response to price changes.