The prisoner's dilemma is a fundamental problem in game

The prisoner's dilemma is a fundamental problem in game theory, which demonstrates why two people might not cooperate even if it is in both their best interests to do it.
A. fundamental problem in game theory, which demonstrates why two people might not cooperate even if it is in both their best interests to do it
B. fundamental problem in game theory demonstrating why two people might not cooperate even if it was both in their best interests to do so
C. problem fundamental to game theory that demonstrates why two people might not cooperate even if it is in both their best interests to do it
D. fundamental problem in game theory that demonstrates two people who might not cooperate even if it is in both their best interests to do it
E. fundamental problem in game theory that demonstrates why two people might not cooperate even if it is in both their best interests to do so