Mary's Bakery is trying to determine what price to charge for its cookies, so Mary places a low price on them and raises it each week, keeping track of how many she sells. Then she determines what her cost was for the cookies and determines which price was the most profitable. What form of research was Mary conducting?

Mary's Bakery is trying to determine what price to charge for its cookies, so Mary places a low price on them and raises it each week, keeping track of how many she sells. Then she determines what her cost was for the cookies and determines which price was the most profitable. What form of research was Mary conducting? 



A. observation

B. survey

C. scanner-based

D. an experiment

E. a panel


Answer: D. an experiment


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