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. Psychologists divide the experimental subjects into two groups and let them solve the same problem in the same field. One group can only eat radish while the other group can also eat biscuits. As a result, the group that only eat radish insists on time It is shorter because they consume self-control while resisting the temptation of cookies. 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.']