Natalie Is the Marketing Director of One Dollar Stores, a Retail

Natalie is the marketing director of One Dollar stores, a retail chain in Canada.From the recent sales reports, Natalie noticed that sales had increased in some stores and decreased in others.She is unable to predict the reason for this variation in sales.The method of research that Natalie is likely to employ to gain a better understanding of the variation, and to clearly define the cause for variation will be:

A) exploratory research.
B) panel research.
C) syndicated marketing survey.
D) conclusive research.
E) scanner research.