The table presents the findings of a cost-benefit analysis concerning the construction of a new runway at an airport. costs US$m private 100 external 25; benefits US$m private 125 external 20. Which statement about the new runway is correct?
- AThe net external benefit is US$5 million.
- BThe net private benefit is US$25 million.
- CThe net social benefit is US$105 million.
- DThe net social benefit is US$145 million.