Private Markets Will Always Provide Too Few Public Goods Because

Private markets will always provide too few public goods because

A) the private marginal cost is less than the social marginal cost.
B) it is unlawful for private firms to provide public goods.
C) of the negative externalities associated with these goods.
D) private markets will never provide goods at a price of zero,which is the efficient price.
E) private markets will never provide goods that they know the government could provide.