Why Did Allowing (And Even Requiring)participants to Communicate When They

Why did allowing (and even requiring) participants to communicate when they played the Trucking Game (Deutsch & Krauss,1962) fail to engender trust and cooperation?

A) Participants were more interested in general conversation than the game itself.
B) Participants became so caught up in the competitive game that they forgot to communicate with their opponents.
C) Participants could never figure out how to use the intercom.
D) Participants used communication primarily as means of threatening their opponents.
E) Participants were not allowed to bargain or negotiate in their communications.