According to the Coase Theorem, if transactions costs are low then a private market (that is, an unregulated market) is efficient A)only if property rights are assigned to the person who is being harmed by the external cost. B)only if property rights are assigned to the person who is creating the external cost. C)if property rights are assigned either to the person who is creating the external cost or to the person who is being harmed by the external cost. D) if property rights are eliminated wherever an external cost or benefit appears.