Question: Which proposition below is the most powerful refutation of Olivecrona's psychological explanation of law?
A: Coercion plays no part in our decision to obey the law.
B: He provides no empirical evidence in support of his thesis.
C: His argument is itself metaphysical.
D: He neglects the relation between morality and legal duty.
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option. Provide exactly two different responses that are separated with 6 asterisk symbols: ******.
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