Here's why:

* Transverse Waves: In transverse waves, the oscillations (vibrations) of the medium are perpendicular to the direction the wave travels. Imagine shaking a rope up and down – the wave moves horizontally, but the rope vibrates vertically.

* Light: Light is an electromagnetic wave. It doesn't require a medium to travel, and its oscillations are the electric and magnetic fields, which are always perpendicular to the direction of wave propagation.

Other options:

* Sound: Sound waves are longitudinal, meaning the vibrations of the medium (like air) are parallel to the direction the wave travels. Imagine compressing and expanding a spring – the wave moves in the same direction as the spring's compression and expansion.

* Water Waves: Water waves are a combination of transverse and longitudinal motion. While the wave crest travels horizontally, the water molecules move in a circular motion, combining both perpendicular and parallel motion.