Discussion
The takeoff distance constraint on a constraint diagram appears as
Answer: C
Correct answer: A line requiring more thrust as wing loading rises
The takeoff constraint rises to the right. A higher wing loading means a smaller wing for the same weight, so the lift-off speed is higher and more distance is needed to reach it - which must be paid for with more thrust if the field length is to be held.
So takeoff bounds the design from below and to the right, and the feasible region lies above the line. A horizontal line would mean the requirement is independent of wing loading, and a vertical line would mean it fixes a wing loading regardless of thrust, which is the character of the landing constraint instead.
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