Answer:
self-regulation
Step-by-step explanation:
Self-regulation refers to an individual's ability to plan, monitor, and evaluate their thoughts, feelings, and behaviors. When able to self-regulate, the individual responds to a given situation through internal processes and resources rather than becoming an object. passive and controlled by the influence of environmental factors.
According to this concept, we can state that when an 18-month-old boy throws a tantrum because he cannot eat a cookie, he is showing that he has not yet developed his self-regulation as he is unable to monitor his behavior because of an unpleasant situation.