The Reason That the superordinate Goal Strategy Works in Promoting

The reason that the superordinate goal strategy works in promoting cooperative climates is that:

A) when a goal is imposed on a group by a leader, groups lose their leadership
B) when a goal is unattainable, people like to commiserate with each other
C) when a goal is unattainable, people suppress their motivation to succeed
D) when different groups have to work together on a common goal, inter-group conflict tends to decrease
E) when a goal is motivating, groups develop new organizational structures to manage their work more effectively