A study to evaluate cognitive function was developed. Researchers took a group of adults and randomly divided them into two groups. One group was told to drink Kombucha (a fermented drink made up of black tea, sugar, bacteria, and yeast) every day for a week, while the other group was told not to drink Kombucha that week. Researchers then compared how well each group scored on a multiple-choice test. (3 pts) a. What is the dependent variable? b. What is the independent variable? c. What is the control group