Discussion
Wing sweep affects the lift curve slope by
Answer: D
Sweep reduces the slope, since only the component of the flow normal to the quarter-chord line does the work, and simple theory scales the slope with the cosine of the sweep angle. That loss is accepted in exchange for a higher critical Mach number. Sweep lowers rather than raises the effective aspect ratio for this purpose. The section alone cannot determine a three-dimensional slope. And the reduction applies throughout the speed range, not only transonically.
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