Stark and Edward Never Liked One Another

Stark and Edward never liked one another. Usually they handle competition by achieving their goals through gossip, coalitions, etc. This created a bad atmosphere in the department. One day, the team leader called Stark and Edward to her office to discuss the problem. After controlling their tension, both opened up and explained the reasons for their behavior. What kind of skills do Stark and Edward need to develop in order to face these kinds of situations?

A) Conflict management skills
B) Goal setting skills
C) Situational knowledge skills
D) Communication competence skills