<em><u>Self-regulation,</u></em><em> in psychology, is determined as a process in which an individual is capable of controlling his or her thoughts, behavior, and emotions in the tracking process of "long-term goals" i.e, an individual does things according to the demands of a specific situation. Therefore, it refers more significantly, to an individual's capability of managing disruptive impulses and emotions.</em>
<em><u>As per the question, Darren is displaying self-regulation in his actions.</u></em>
C. wars with neighboring kingdoms designed to consolidate Han power.
Explanation:
The Han dynasty was a period between 206BC to 220AD. The expansion of China during the Hans dynasty was as a result of series of military campaigns and cultural assimilation. The expansion stated during the Qin dynasty but reached its peak during the Han dynasty.