The "Volcker disinflation" was A. an episode of stagflation that ravaged the U. S. economy between 1979 and 1989, under the leadership of Fed Chairman Paul Volcker. B. a deflationary cycle that plagued the economy between 1979 and 1989, under the leadership of Fed Chairman Paul Volcker. C. a significant reduction in the inflation rate between 1979 and 1989, under the leadership of Fed Chairman Paul Volcker. D. evidence that workers and firms really had rational expectations since they adjusted their expectations of inflation as soon as the Fed's monetary policy announcement was made. The unemployment rate A. fell from 10% to 6% during the period of the Volcker disinflation. B. remained unchanged at 6% during the period of the Volcker disinflation. C. rose from 6% to 10% during the period of the Volcker disinflation. D. rose from 6% to a higher rate in the beginning of the Volcker disinflation, but as the public started using rational expectations, the unemployment rate fell back to 6%.