Answer: The correct option is the ground.
Explanation:
Sound is a longitudinal wave. In longitudinal wave, the particles vibrate parallel to the direction of the propagation of the wave.
It needs medium to travel. It can travel in solid, liquid and gas.
Sound wave travels faster in solid in comparison to liquid.
It travels slowest in air.
Ground is a denser medium. Here, the sound wave travels faster in comparison to the ocean and the air.
Therefore, the correct answer is the ground.
