 The cost \(C\) is assumed to be a negative number. The “temptation” here is to get the benefit without the cost, the reward is the benefit with the cost, the punishment is to get neither and the sucker payoff is to pay the cost without realizing the benefit. So the payoffs are ordered \(B \gt (B+C) \gt 0 \gt C\). As in the two-player game, it appears that \(\bD\) strongly dominates \(\bC\) for all players, and so rational players would choose \(\bD\) and achieve 0, while preferring that everyone would choose \(\bC\) and obtain \(C+B\).