Darren is an active twelve-year-old boy. When his friend Simon cheats in a game, he tends to get irritated. However, Darren controls his anger and tries explaining to Simon why cheating is bad. Which developmental aspect is Darren displaying in his actions?

Self-regulation  

Explanation:

Self-regulation is a behavioral control process that involves the control of ones behavior, maintaining emotional control, responses and thoughts in the pursuit of long-term goals. Darren is controlling his emotion, not to react harshly to Simon's behavior and explaining to him why cheating is bad in the hope that he will change. Darren is displaying self-regulation.

b) to encourage free trade