The Social Marginal Cost of the Production of Snowmobiles

The social marginal cost of the production of snowmobiles

A) does not include the increased risk of accidents caused by the operation of snowmobiles.
B) does not include the carbon emissions from snowmobiles.
C) includes the noise pollution imposed on those living near snowmobile trails.
D) is less than the marginal external cost of production.
E) is greater than the sum of the private marginal cost and external cost.