A six-month moving average forecast is generally better than a three-month moving average forecast if demand

A) is rather stable.
B) has been changing due to recent promotional efforts.
C) follows a downward trend.
D) exceeds one million units per year.
E) follows an upward trend.

A six-month moving average is better suited for stable demand patterns, as it allows for a smoother trend line and reduces the impact of seasonal or short-term fluctuations. A three-month moving average may be more appropriate for demand that has recently changed due to promotional efforts or shows an upward or downward trend, but overall, the six-month moving average is generally a safer choice. The level of demand (such as exceeding one million units per year) does not necessarily affect the choice between three- and six-month moving averages.