According to Cultural Relativism, What's Morally Right for a Culture

According to cultural relativism, what's morally right for a culture is simply whatever that culture approves of or believes is morally right. According to the text, which of these evaluations is most appropriate?

A) This theory is incoherent, because it allows that different cultures have different beliefs about what is morally right.
B) This theory is inconsistent with our considered moral judgments, because not everyone within a culture will agree on what is morally right.
C) This theory is inconsistent with our moral experience, because it means that cultures cannot approve of an action that is morally wrong-but we know that sometimes cultures do approve of morally wrong actions.
D) This theory is not useful in moral problem solving, because it gives me no way to find out what is the right thing to do.