In a Repeated Game with Reciprocity, the Two Players

In a repeated game with reciprocity, the two players

A) could each earn a higher payoff than if they aggressively countered each other's single-period strategy.
B) tend to earn less than if they aggressively countered each other's single-period strategy.
C) will have less incentive to collude explicitly or tacitly.
D) often end up in a price war.