Which one of the following statements about forecasting is true?

Question $11$ options:

More accurate forecasts are obtained for a group of items because the individual forecast errors for each item tend to cancel each other.

Less accurate forecasts are obtained for a group of items because only one forecast is being made instead of several.

Less accurate forecasts are obtained for a group of items because the individual forecast errors for each item tend to reinforce each other.

More accurate forecasts are obtained for a group of items because only one forecast is being made instead of several.