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Which is the minimum requirement for pure directional stability?

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in Aircraft Design by (701k points)
Which is the minimum requirement for pure directional stability?

(a) Slope of yawing moment curve positive

(b) Negative lift curve slope

(c) Negative pitching moment coefficient curve slope

(d) Positive zero lift pitching moment coefficient

This question was addressed to me during an online interview.

I would like to ask this question from Lateral-Directional Static Stability and Control in chapter Stability, Control, and Handling Qualities of Aircraft Design

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The correct choice is (a) Slope of yawing moment curve positive

The best I can explain: An aircraft is said to be in directional stability if the yawing moment curve slope is positive. Negative pitching moment coefficient curve slope is minimum criteria for longitudinal static stability. Positive value of zero lift pitching moment coefficient will be used to design an aircraft to trim at positive AOA.

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