Choice "D" is correct. The Delphi method of forecasting involves the use of multiple teams in geographically remote locations. Information is shared and gathered in a central point and compiled and then redistributed for comment. The method is highly interpersonal and requires significant judgment.Choice "c" is incorrect. Although all forecast methods require some judgment regarding both variables used and the evaluation of results, quantitative methods, such as time series models, rely more heavily on mathematical relationships than pure judgment.Choice "a" is incorrect. Although all forecast methods require some judgment regarding both variables used and the evaluation of results, quantitative methods, such as econometric models, rely more heavily on mathematical relationships than pure judgment.Choice "b" is incorrect. Although all forecast methods require some judgment regarding both variables used and the evaluation of results, quantitative methods, such as regression analysis, rely more heavily on mathematical relationships than pure judgment.