As teams increase in size

A) the communication becomes less congested.
B) it becomes easier to manage them.
C) the number of potential interactions increases geometrically.
D) the nature of the task ceases to affect team effectiveness.
E) team effectiveness reaches its peak.

As teams increase in size, the number of potential interactions (i.e. communication, coordination, and collaboration) increases geometrically, which can make it more complex to manage the team and hinder their effectiveness. Hence, option C is the best choice. The other options are incorrect as communication becomes more congested, it becomes harder to manage them, the nature of the task affects team effectiveness, and team effectiveness may not necessarily reach its peak with an increase in team size.