Correct answer
The lower it is, the less drag under those same conditions.
A lower value: under those equal conditions, lower Cx produces less drag and reduces the energy needed to overcome it. The coefficient is not itself the drag force. It also does not guarantee greater stability or less deviation in crosswinds; those properties depend on other factors and aerodynamic forces. Drag, lift and side forces are distinct.
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The lower it is, the less drag under those same conditions.
The higher it is, the less drag under those same conditions.
It has no effect on drag when the other conditions remain equal.
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