An empirical inquiry into the actual rules or standards of a particular group is Normative justice Descriptive justice Interpersonal justice Metaethics

In the context of the given options, the correct answer is Descriptive justice.

Explanation:

1. Normative Justice refers to the theoretical principles of what is considered just or unjust, focusing on the ideals of justice rather than how justice is actually practiced.
2. Descriptive Justice involves researching and describing the rules, standards, and practices within a specific group or society, which is what the inquiry refers to.
3. Interpersonal Justice deals with fairness in interactions between individuals, largely concerned with how people treat each other.
4. Metaethics examines the nature of ethics itself, investigating questions about what is right or wrong without delving into specific practices or groups.

Thus, the inquiry into the actual rules or standards of a particular group aligns best with Descriptive justice.