Which type of wave does not require a medium to travel through?
a.
an ocean wave
b.
a light wave
c.
a sound wave
d.
a tidal wave
will it be b. light wave

The answer is the option B. Light wave. Electromagnetic waves are the only waves that do not require a medium to travel, this is they can move through empty space. And light is an electromagnetic wave, For the others, you can see that an ocean wave travels through water, the sound wave travels through air or even through solids, but not through empty space. A tidal wave is the same case of ocean waves.

I'll do it rn and then answer