Self-interest usually dictates what kind of outcome for the players in a prisoners' dilemma game?

Question

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In a prisoners' dilemma game, each player's self-interest usually leads to a sub-optimal outcome for both players. This is because both players are incentivized to choose the dominant strategy of betraying the other player, which results in a worse outcome for both compared to if they had both cooperated. Therefore, the best choice is A) sub-optimal.

Self-Interest Usually Dictates What Kind of Outcome for the Players