Lucas and Sargent Argue That the Short-Run Trade-Off Between Unemployment

Lucas and Sargent argue that the short-run trade-off between unemployment and inflation is caused by

A) workers and firms using Bank of Canada policy to predict inflation.
B) workers and firms using all the information available to predict inflation.
C) workers and firms rapidly adjusting wages and prices in response to changes in expectations.
D) workers and firms being fooled by unexpected changes in monetary policy.
E) workers and firms refusing to negotiate wages on a regular basis.