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An economist for the Brookings Institution argues that​ "a price on carbon would minimize the cost of steering economic activity away from the greenhouse gas emissions that threaten the​ climate."
​Source: Fred​ Dews, "10 Things You Should Know about the Carbon​ Tax," brookings.edu, May​ 4, 2016.
In what sense does a carbon tax put a price on​ carbon?
A carbon tax puts a price on carbon by increasing the private cost of polluting.
C.
A carbon tax puts a price on carbon by decreasing the social benefit of polluting.
D.
A carbon tax puts a price on carbon by decreasing the private benefit of polluting.