Discussion
In the Dutch roll, the rolling and yawing components are
Answer: C
They are coupled with a phase difference that depends on the configuration, commonly a quarter to a half cycle. The phase decides whether a pilot perceives a wag with a little rock or a rock with a little wag, and flight test measures it alongside the roll-to-sideslip ratio. Exact phase or antiphase are special cases real aeroplanes do not sit at. Independence would mean no coupling, and then there would be no Dutch roll to discuss at all.
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