Answer: Effortful control
Explanation:
Effortful control is the control mechanism in which self regulation is performed in terms of behavior and emotional reaction towards things and situation. This control help in adjustment and management in particular situation by resisting certain action and making it flexible and patient.
According to the question,Julee is displaying effortful control by resisting her action of eating cookies before dinner. This control is making her patient and flexible so that she can have her dinner as well as gain two cookies after it.