graph above. It shows a market with a negative externality. Which of the following is correct given this graph? a. The private sector will not produce any units because it is not profit to do so b. People working in their self-interest will result in Qb units, even though the socially optimal amount is Qa c. People working in their self-interest will result in Qa units, even though the socially optimal amount is Qb d. The self-interest created outcome equals the socially optimal outcome