The correct answer would be, the exercise of willpower.
This illustrated that self control momentarily weakens the exercise of willpower.
Explanation:
When a person has control over what he is doing and what he is not going to do, this is called as self control. Self control is basically the exam of willpower. Strong willpower will lead to strong self control and vice versa.
So when a study was conducted in which the participants were doing a tedious task, and during this task they were required to not eat the tempting chocolate chip cookie. Resisting the temptation led the participants to give up sooner than normal on efforts to complete that task. This illustrated that self control momentarily weakens the exercise of willpower, because the participants were controlling themselves, which weakens their will power and they could not go longer with the task.
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