Answer: Cooperation
Step-by-step explanation:
The cooperation is one of the type of organizational skills which basically refers to the group so that we can work together for achieving the desired goals in an organization.
According to the given question, both Tressa and Arnold are decide to creating the new game together and in their project they both involve few kids and their coordinating efforts is one of the example of cooperation.
The main benefit of the cooperation is that is that it reduce the complexity as each tasks are assigned to each members in the team and also increase the productivity in an organization.
Therefore, Cooperation is the correct answer.