Explanation:

- Morals that govern one's behavior: Refers to the principles or rules that guide how a person conducts themselves, particularly distinguishing right from wrong.

- Option 1: Intuition: The ability to understand something instinctively, without the need for conscious reasoning. It is more about gut feeling than morals.

- Option 2: Attitude: A settled way of thinking or feeling about something, typically reflected in a person's behavior. Not directly about moral guidelines.

- Option 3: Psychology: The scientific study of the mind and behavior. While it explores behavior, it doesn’t specifically govern morals.

- Option 4: Ethics: The branch of knowledge that deals with moral principles, governing a person's behavior or conducting an activity.

Correct Answer: Option 4 - Ethics