SALES FORECAST KNOWLEDGEA sales forecast refers to
选项：

A: the total sales of a product that a firm expects to sell during a specified time period underSpecified environmental conditions and its own marketing efforts.
B: sales goals based on past performances of individual sales representatives, used as motivationFor productivity among this staff.
C: the total sales from a product that could be generated with a hypothetical set of preferredEnvironmental forces.
D: the total industry sales generated by a product during a specified time period that results fromSpecified environmental conditions.
E: published information about competitors’ sales from the NAICS.