Discussion
On approach in gusty air, passengers at the rear of a swept-wing transport report a regular side-to-side motion with a period of about four seconds, while the flight deck reports it as mild.
The most likely explanation is
Answer: A
A four-second lateral oscillation is the Dutch roll, and the rear cabin feels it worst because the yaw component gives the largest lateral displacement furthest from the centre of gravity. That asymmetry between cabin and cockpit is the classic reported signature. A spiral divergence does not oscillate. Roll subsidence is aperiodic and would not repeat. The short period is longitudinal and would be felt as pitching, not as side-to-side motion.
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