Step-by-step explanation:
A transverse wave is a wave in which the displacement of the particle is perpendicular to the direction of propagation of the wave. Electromagnetic waves and waves on a string are examples of transverse waves.
For a horizontally advancing transverse wave, the particle of the medium will move up and down (vibrate/oscillate) in the vertical direction which is perpendicular to the direction of the motion of the wave.
Thus, for a transverse wave, there is no Horizontal motion.
Final answer:
The correct option is: D) Horizontal.