Which of the following factors is NOT likely to spur the oil-producing nations of North Africa/Southwest Asia to find other ways to generate income?

Question

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Factors A, B, and D all present challenges to the profitability and sustainability of relying solely on oil production for income. The depletion of fossil fuel reserves (A), the development of alternative energy sources (B), and the rising costs of extracting and refining oil (D) could all motivate oil-producing nations to diversify their economies. However, an increase in air travel (C) would likely increase the demand for oil, not spur these nations to find other ways to generate income.

Which of the Following Factors Is NOT Likely to Spur