The correct answer is B. Frequency.
Frequency is the number of waves that pass a given point in a given amount of time. It is measured in Hertz (Hz), which is equal to one wave per second.
The higher the frequency, the higher the pitch of the sound.Velocity is the speed of a wave. It is measured in meters per second (m/s). The velocity of a sound wave depends on the medium through which it is traveling. For example, sound travels faster through air than through water.
Displacement is the distance from a point’s rest position to its current position. It is measured in meters (m). Displacement is a vector quantity, which means
it has both magnitude and direction.Acceleration is the rate of change of velocity. It is measured in meters per second squared (m/s^2). The acceleration of a sound wave is zero, because the velocity of a sound wave does not change.