The diagrams illustrate the costs and benefits in four markets. Which pair of diagrams indicates the presence of a positive consumption externality and a negative production externality?
- Apositive consumption externality: 1; negative production externality: 2
- Bpositive consumption externality: 2; negative production externality: 3
- Cpositive consumption externality: 3; negative production externality: 4
- Dpositive consumption externality: 4; negative production externality: 1