Post-World War II Inflation Rates,as Measured by the CPI

Post-World War II inflation rates,as measured by the CPI

A) are overestimated due to the inability to measure quality improvements
B) are underestimated due to the exclusion of import prices
C) are not comparable across decades due to decennial changes in the base year
D) have tended to move in the opposite direction of inflation rates as measured by the GDP deflator
E) have become increasingly accurate as technology has improved