Answer:
C. qualitative and quantitative
Explanation:
Qualitative forecasting should be used when the data is insufficient or less. Here the managers applied the subjective that depend upon the opinion and the consumer judgement to forecast the future. The methods like sales force, excuetive opinion represent the qualitative one
On the other hand the quantitative one should be used when the mathematical model to the past and the present are available. Like time series analysis, regression models, etc
hence, the option c is correct
