The Players in a Game Theory Situation Often Do Not

The players in a game theory situation often do not act in their joint interest because of which of the following?

A) Players strive to minimise their opponents' profits.
B) They do not realise the benefit of cooperation.
C) Players understand the game but they do not know which action(s) will benefit their joint interest.
D) Players do not understand the game and its payoffs.
E) It is not in each player's self-interest to cooperate.