If Policymakers Use a Pollution Tax to Control Pollution,the Tax

If policymakers use a pollution tax to control pollution,the tax per unit of pollution should be set

A) equal to the marginal external cost at the economically efficient level of pollution.
B) equal to the marginal private cost of production at the economically efficient level of pollution.
C) equal to the amount of the deadweight loss created in the absence of a pollution tax.
D) at a level low enough so that producers can pass along a portion of the additional cost to consumers without significantly reducing demand for the product.