The correct option is D rotational, circular
In a circular motion, the object just moves in a circle whereas in rotational motion the object rotates about an axis.
A ferris wheel is a structure consisting of a rotating upright wheel with multiple passenger-carrying cabins. The wheel itself follows a rotational motion.
These passenger-cabins are attached to the rim in such a way that all the cabins move in a circle. So the motion of people riding the ferris wheel while sitting inside the cabin, can be considered as circular motion.
Hence, the motion of a Ferris wheel is rotational whereas people riding on the Ferris wheel undergoes circular motion.