The Concept of the Natural Rate of Unemployment

The concept of the natural rate of unemployment

A) states that higher inflationary rates are necessary to substantially reduce its value.
B) is credited to A. W. Phillips.
C) reflects, in part, the willingness of workers to remain voluntarily unemployed rather than take unattractive or lower-paying jobs.
D) reflects the fact that people are lazy and will not work unless they have to.
E) denotes workers temporarily unemployed as a result of expansionary monetary and fiscal policies.