Hi! I am incredibly confused about these homework questions I have. Thanks for your help, it means so much because I am genuinely so confused.

Question 9 [1 point} A researcher hypothesizes that attitudes toward recycling can be improved by pro- recycling messages. She randomizes participants to either the treatment or control condition. The treatment group reads a short argument in favor of recycling then completes a questionnaire about attitudes toward recycling {on a scale of 1-1 with higher values indicating more positive attitudes}. The the control group doesn't read anything but responds to the same questionnaire. In this design, attitude toward recycling is O A} the dependent variable. 0 Hi the independent variable. (:3 C} the causal variable. (:3 D] the predictor variable