The study of moral psychology includes which of the following?

The study of moral psychology primarily focuses on understanding how various psychological factors, particularly emotions, influence moral judgments and ethical decision-making. This area of study examines how feelings such as empathy, guilt, or anger can affect the choices individuals make regarding right and wrong. It delves into the cognitive processes that underlie these judgments, exploring how emotions can either enhance or detract from our moral reasoning.

In contrast, while the impact of culture on ethical decision-making, the relationship between law and morality, and the analysis of ethical theories are all relevant topics within the broader field of ethics, they do not specifically pertain to the psychological aspects of morality as focused on in moral psychology. Therefore, the focus on emotions as a key element in how we develop moral judgments distinctly characterizes the correct option.