need explanation please.

Price ($/unit) 1. The diagram to the right illustrates demand and Social Marginal Cost supply for a good with a A) positive externality with a marginal external 40 benefit of $10. Supply B) positive externality with a marginal external benefit of $5 30 B C C) negative externality with a marginal external cost : : : DE of $10. : 20 : D) negative externality with a marginal external cost H: : of $5. :L E) none of the above. 10 MN : In . . .. . . . . .. .;... Demand 2. For the diagram, the unregulated market price and 200 400 600 800 quantity is Widgets (units) A) P = 20 and Q = 400 B) P = 25 and Q = 300 C) P = 30 and Q = 400 D) P = 15 and Q = 300 3. Given the diagram, what area represent the deadweight loss of the unregulated market equilibrium A) Area C B) Area D C) Area FG D) Area GJ E) None of the above. 4. Given the diagram, what area represent the total external cost at the unregulated market equilibrium A) Area DGJFILMN B) Area DGJFIL C) Area FIL D) Area GJ E) None of the above. 5. To correct for the market imperfection illustrated above, the government should A) offer a subsidy of $5 per unit. B) impose a tax of $5 per unit. C) offer a subsidy of $10 per unit. D) impose a tax of $10 per unit. E) impose a price floor of $25 and purchase the excess supply. 6. Given the diagram, what area represent the total net benefits to society at the allocationy efficient equilibrium A) Area ABEFHIKLM B) Area ABEFGHIJKL C) Area ABEHK D) Area ABEHK-D E) None of the above. 7. Which of the following goods has the characteristic of being non-excludable, but has the characteristic of rivalry in consumption? A) A congested highway with no toll booth. B) A lighthouse. C) A satellite signal. D) Chocolate