In the given study, the package information is confounded with color of the box.
Answer: Option B
Explanation:
A Confounding variable in an experiment refers an outside influences which can use to see whether it changes the effect of the independent variable or the dependent variable. These are the extra influences or variable that enters the experiment and hence one should make sure to remove them as otherwise, the result will be useless.
In the present experiment, the investigator wanted to see the effect of information on the box on the buyers but the color of the boxes has affected the choices of the buyer and hence has affected the experiment.