The diagram illustrates the market for petrol (gasoline). $S_p$ represents the supply of petrol based on the private cost of petrol production and $S_s$ represents the supply of petrol based on the social cost of production. Which distance represents the market failure caused by the production of petrol?
- A$OQ_1$
- B$OQ_2$
- C$Q_2Q_1$
- D$Q_3Q_1$