The manager of the golden orange drink company states that he is very concerned with the continuing decline in sales of the company's major product, a concentrated orange drink. the manager has asked for your assistance in identifying the reasons for the sales decline. the most appropriate way to begin would be with:
a. a case analysis.
b. an experiment in which price is systematically varied.
c. descriptive research.
d. a controlled market test.
e. exploratory research.