According to moral relativism (also known as subjectivism), what makes an action morally right or wrong

What moral relativism holds is that what is morally right or wrong depends on the norms or values accepted by each culture.

Explanation:

According to moral relativism, there is no universally valid criterion for judging human actions, habits or institutions, so that moral judgments can only aspire to validity within a given code. Consequently, moral norms and estimative judgments do not have an absolute or objective truth value, but rather relative to the traditions, convictions or practices of a group of people (normative sociological or cultural relativism) or in some occasions, relative to the beliefs of a single person (individual or subjectivist normative relativism).Therefore what is right and what is wrong depends on each culture, race, ideology, age, class, situation or particular conviction.