Answer:
The correct answer is - sensory adaptation.
Explanation:
Sensory adaptation is an adaption to a particular sensory stimulation in case of longer or constant exposure by the reduction in sensitivity to this stimulus after constant exposure to it.
It reduces our focus on a constant stimulus to free awareness and the important resources to attend to other stimuli in the environment around us. In the given question sound is an constant stimulus which is reduces by the process sensory adaption and draw attention to important stimuls around.