Looking at the historical values for annual inflation in the United States as measured by the Consumer Price Index, it is clear that inflation was

A) higher on average during the 1990s than during the 1970s.
B) higher on average during the 2000s than during the 1970s.
C) never less than 0 percent at any time during the last 50 years.
D) higher on average during the 1970s than during the 1980s.
E) was never greater than 10 percent at any time during the last 50 years.

D