At the Beginning of a Year, Decision Makers Expect the General

At the beginning of a year, decision makers expect the general level of prices to increase at a 6 percent annual rate. The CPI increases from 150 to 154.5 during the year; this indicates that

A) decision makers underestimated the rate of inflation during the year.
B) decision makers overestimated the rate of inflation during the year.
C) decision makers accurately forecast the rate of inflation during the year.
D) the rate of inflation during the year was 4.5 percent.