If the Government Wanted to Efficiently Limit the Emission of Carbon

Multiple Choice

If the government wanted to efficiently limit the emission of carbon monoxide by all firms to exactly 4 million tons it could

A) issue rights to pollute worth 4 million tons and let the firms trade those rights in a market.
B) appeal to firms' environmental conscience to pollute less.
C) subsidize production.
D) rely on the Coase Theorem.