Why Income Tax Expense? What How would I know to answer Income Tax Expense from the given information?

Company A is a large passenger airline. As part of their annual internal budget process, they do a sensitivity analysis of their revenue forecast over their existing routes and schedules. The analysis evaluates the impact of a three percent decline in passenger revenue compared to a three percent increase. Which of the following expenses would show the largest change in the analysis? Aircraft maintenance expense X O Salary expense for the flight crew Depreciation and amortization expense O Income tax expense X Incorrect