What is the independent variable in this study? Group of answer choices A - Choice (Chose Shocks vs. Did Not Choose Shocks) B - Participant agreement with the statement, "To what extent do you think the "learner" deserved the number of shocks delivered to them during the word-pair task? They provided ratings on a scale that ranged from 1 (The learner did not deserve the shocks) to 7 (The learner deserved the shocks). C - Role ("Observer" Role vs. "Learner" Role vs. "Teacher" Role. D - Choice (No Choice vs. Chose Shocks vs. Did Not Choose Shocks) E - There is too little information in this study to determine the independent variable