Option d) It is traveling faster than the speed of sound
Explanation:
A sonic boom is a sound that is produced as a result of the shock wave produced by an object travelling faster than the speed of sound. When a plane travels through air, it produces waves. If a plane is travelling slower than the speed of sound, then the sound waves propagate ahead of the plane. If the plane breaks the sound speed barrier, then a sonic boom is head when it flies past. The boom is a disturbance of the plane sound waves as it breaks the speed of sound.
