Private markets don't account for externalities because a. externalities don't occur in private markets b. buyers and sellers in private markets are...

Private markets don't account for externalities because

a. externalities don't occur in private markets

b. buyers and sellers in private markets are only interested in social well-being

c. self-interested buyers and sellers have no incentive to consider the effects of their behaviour on others

d. externalities only occur in a political setting