An airfoil provides lift because air moving over a wing must travel
A) a greater distance than air moving under the wing, creating a lower pressure system above the wing.
B) a greater distance than air moving under the wing, creating a higher pressure system above the wing.
C) a lesser distance than air moving under the wing, creating a lower pressure system above the wing.
D) a lesser distance than air moving under the wing, creating a higher pressure system above the wing.
Answer: A
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