The answer you looking for is D
C) medium.
The medium of a wave is any substance that carries the wave, or through which the wave travels.Ocean waves are carried by water, sound waves are carried by air, and. the seismic waves of an earthquake are carried by rock and soil.
Typical day of a new day in my house with my phone in my car so I’m not going hard I don’t know how much it was
If it gains an electron it will be negatively charged and if it loses an electron it will be positively charged