What type of wave does not require a medium? electromagnetic wave or mechanical wave?

Electromagnetic Waves

Explanation:

Electromagnetic waves do not require a medium to propagate whereas mechanical wave does.

Example: Sound wave is mechanical wave. It needs a medium to transfer energy from one place to another.

And, X-rays. These are electromagnetic waves & these transfer energy via electric & magnetic fields.

there are no statements provided but here is why:

sulfur belongs to group 16 because it can be found in nature whether it is in a free or combined state.

hope this

i think it's c. i'm not sure but i think so.