Cooperation in Trade Using the Prisoners Dilemma Model Is Possible

Cooperation in trade using the prisoners dilemma model is possible when

A) iteration doesn't change the nature of the reward structure.
B) governments use reciprocity strategies to enforce Pareto suboptimal outcomes.
C) governments care about the payoffs they will receive in future rounds of bargaining.
D) governments use reciprocity strategies to enforce Nash equilibrium outcomes.
E) reciprocity strategies don't change the nature of the reward structure.