Jenae noticed that many of her co-workers would opt for the coffee that appeared to be most recently brewed, regardless of the flavor of the coffee offered. This leads her to believe that what she was witnessing was not really representative of everyone's true flavor preferences. She adapted her experimental study accordingly. Select one control in Jenae's experimental study. A. Jenae monitors the habits of the co-workers who do not drink coffee.
B. Jenae places condiments at random places throughout the kitchen.
C. Jenae takes note of the frequency in which co-workers refill their coffee mugs.
D. Jenae keeps the same amount of sugar and artificial sweetener at each location.