Which of the following would decrease the supply of airline travel?

Question

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Higher fuel costs would increase the cost of operating aircraft, which would in turn decrease the supply of airline travel as airlines may choose to reduce the number of flights or routes they operate, or increase ticket prices. Reduced numbers of airline travellers (A) would decrease demand but not supply, new airline companies (B) beginning operations would increase supply, and lower prices for airline tickets (D) could theoretically decrease supply if airlines choose to reduce the number of flights or cut costs elsewhere. However, in practice, lower prices often lead to increased demand, which would increase rather than decrease supply.

Which of the Following Would Decrease the Supply of Airline