Which Would Not Generally Be Considered a Feature Common to All

Which would not generally be considered a feature common to all forecasts?

A) An assumption of a stable underlying causal system.
B) Actual results will differ somewhat from predicted values.
C) Historical data is available on which to base the forecast.
D) Forecasts for groups of items tend to be more accurate than forecasts for individual items.
E) Accuracy decreases as the time horizon increases.