Only a reduction of 10 percent in the number of scheduled flights using Greentown' s airport will allow the delays that are so common there to be avoided. Hevelia airstrip, 40 miles away, would, if upgraded and expanded, be an attractive alternative for fully 20 percent of the passengers using Greentown airport. Nevertheless, experts reject the claim that turning Hevelia into a full-service airport would end the chronic delays at Greentown. Which of the following, if true, most helps to justify experts' position?
A: A second largely undeveloped airstrip close to Greentown airport would be a more attractive alternative than Hevelia for many passengers who now use Greentown.
B: If an airplane has to wait to land, the extra jet fuel required adds significantly to the airline's costs.
C: Turning Hevelia into a full-service airport would require not only substantial construction at the airport itself, but also the construction of new access highways.
D: Several airlines use Greentown as a regional hub, so that most flights landing at Greentown have many passengers who then take different flights to reach their final destinations.
Choose A, B, C or D as your solution.
D