Economists Generally Believe That Relative to the True Cost of Living

Economists generally believe that relative to the true cost of living, the CPI

A) is perfectly measured.
B) overstates it by a factor of 2 (meaning that inflation is really only half as bad as the government states) .
C) overstates it by a difference of about .8% (meaning that an official inflation rate of 1.8% is really only about 1%) .
D) understates it by a factor of 2 (meaning that inflation is actually twice as bad as the government states) .