Japanese Fishermen Use Gill Nets to Catch Tuna with Great

Japanese fishermen use gill nets to catch tuna with great efficiency. Many environmentalists have objected to this practice since many marine animals such as dolphins and sharks are killed by the nets and discarded by the fishermen. Which of the following statements is most correct?

A) a private solution can be reached through negotiation between the fishermen and the environmentalists
B) a private solution is not practical due to the number of individuals affected
C) the market price of tuna is higher than the socially optimum price of tuna
D) a private solution to this problem would not affect the price of tuna