One analysis revealed that pitchers were more likely to hit batters when the previous batter had hit a home run. this best illustrates a. ingroup bias

The correct answer is the frustration-aggression principle

The frustration-aggression principle refers to the process in which frustration fuels feelings and sensations of anger, which in turn leads people to engage in aggressive behavior. In this instance, a pitcher is likely to feel frustrated after a previous batter has hit a home run. This in turn might lead the pitcher to hit the next batter due to feelings of frustration and anger.