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Answer:
a. required to pay a tax of $0.45 per gallon of gasoline sold.
Explanation:
The marginal external cost shows the difference between the private cost and the social cost. Also it should be the tax imposed amount. In the given case, the value is of $0.45 this represent that there is the tax of $0.45 that should be imposed on the producers in order to internalize the external cost
Therefore, the option a is correct