Answer:
.b. it forces firms to internalize the external cost of emissions
Explanation:
A carbon tax is a fee imposed by the government on any firm that burns fossil fuels. Fossils most used by firms include gasoline, coal, oil, and natural gases. Burning of these fossils emits greenhouses gases such as carbon dioxide and methane, which creates global warming by heating the atmosphere.
A carbon tax forces enterprises to pay for the harsh effects of global warming on society. If the tax is set at a high rate, it deters firms from burning fossils. Companies adopt environmentally friendly production processes to avoid the carbon tax.