Linda Is Studying While Listening to Her IPod

Multiple Choice

Linda is studying while listening to her iPod.She notices that when she raises the volume five decibels when the volume is initially low, the change is very noticeable.However, when the volume is initially high, increasing the volume by five decibels doesn't result in as noticeable of a change in sound.This phenomenon is best explained by

A) the volley principle.
B) Weber's law.
C) perceptual constancy.
D) selective attention.