Which of the following independent variables is likely to make the best study? The dependent variable is very infrequent window breaking, and the independent variable is a treatment to withhold reinforcement for this behavior. The dependent variable is a positive urine test for drug use, and the independent variable is everyday contacts with other drug users. The dependent variable is emotional reactions to correction procedures in learning tasks, and the independent variable is staff responses to these reactions. The dependent variable is ruminating following meals, and the independent variable is the quantity of food consumed at each meal.