Self-control is not only about self-control, but also the ability to eliminate the interference of irrelevant stimuli and persist in completing related tasks (even tasks that you don't like). Self-control is stable and will be consumed. Different opinions. Psychologists divided the experimental subjects into two groups to let them solve problems in the same field. One group can only eat radish, and the other group can also eat cookies. As a result, the group that only eat radish insists on more time. Short because they resist self-control while resisting the temptation of biscuits, they conclude that people's self-control is limited, and excessive use will lead to reduced self-control. Which of the following should be added as a prerequisite for the conclusion of the above conclusion? ['Subjects have different interests in solving problems.', 'Biscuits and radishes have different temptations to test subjects.', 'Biscuits and radishes have different effects on human energy.', 'The anti-interference ability of the two groups of subjects is not exactly the same.']