An airline improves its service by using larger aircraft. The airline says this will cut catering waste and reduce carbon ($\text{CO}_2$) emissions per passenger journey, even though fares may increase. State a private cost and an external benefit of this decision?
- Aprivate cost: bigger aircraft; external benefit: higher fares
- Bprivate cost: higher fares; external benefit: lower $\text{CO}_2$
- Cprivate cost: less catering waste; external benefit: bigger aircraft
- Dprivate cost: lower $\text{CO}_2$; external benefit: less catering waste