For small tractor rotation $\theta$ radians about its CG, and longitudinal seat-to-CG distance R, the seat-base vertical motion $R\theta$ results from which motion?
Pitch is rotation about a transverse horizontal axis. A point a longitudinal distance R from that axis moves vertically by $R\sin\theta\approx R\theta$ for small angles. Roll instead couples vertical displacement to lateral offset, and yaw acts about a vertical axis. Hence **pitch, A**.
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