Answer: a. He is lacking in effortful control
Explanation:
Effortful control is used to describe an individual’s ability to act in a purposeful way that modulates thoughts, emotions and behavior.
Effortful control is thought to regulate downwards, the tendency to react negatively through control of automatic cognitive, emotional and behavioral responses which means that a higher level of Effortful Control will enable Kristopher to cut down on his impulsivity.