Concept:Rolling motion is a combination of rotational motion about an axis and translational motion of the centre of mass.
Explanation:As the cylindrical drum rolls down the inclined plane, it spins about its own central axis.
This spin is rotational motion.
At the same time, the centre of mass of the drum moves forward along the inclined plane.
This movement is translational motion.
Thus, the drum undergoes both rotational and translational motion simultaneously.
Answer:B. rotational and translational