Step-by-step explanation:
B. It refers to an oscillation produced by some energy that creates a wave.
In the context of waves, a disturbance refers to an oscillation or variation from the equilibrium state caused by the transfer of energy. When energy is applied to a medium, it causes particles or elements of the medium to undergo vibrations or oscillations, which in turn propagate and create a wave. The disturbance is the initial energy input or source that sets the wave in motion.