In Order to Forecast the Sales for a Marketing Management

In order to forecast the sales for a marketing management textbook in his geographic vicinity, Lauren, a bookstore owner, decides to use the time-series analysis of sales forecasting. In this case, which of the following is Lauren more likely to do?

A) Combine and average the views of top management representing marketing, production, finance, purchasing, and administration.
B) Request his sales personnel to submit estimates of the future sales in their territories.
C) Measure the relationship between the dependent variable and one or more independent variables.
D) Analyze past sales data and the impact of factors that influence sales like seasonal variations.