Which of the Following Best Defines Time Inconsistency

Which of the following best defines time inconsistency?

A) The increasing inaccuracy of econometric models as the time horizon becomes longer.
B) The effect of economic uncertainty on short- run stabilisation policy.
C) The tendency for the rise in output to be greater in the early years of a president's term, and smaller in the later years.
D) The tendency for policy makers to deviate from a pre- announced optimal policy once agents in the economy have adjusted their behaviour and expectations based on the pre- announced policy.
E) The effects of political electoral cycles on the business cycle.