When there are expectations that there will be inflation

Question

When there are expectations that there will be inflation and expectations are rational, the longrun equilibrium will be:

(a) Where the actual rate of inflation is lower than the expected rate;

(b) Where the actual rate of inflation is higher than the expected rate;

(c) When the actual rate of inflation is the same as the expected rate;

(d) There cannot be equilibrium when there are expectations of inflation.