Linda usually listens to music on her iPod while studying. When the volume is initially low, raising it by five decibels is highly noticeable. However, when the volume is initially high, increasing it by five decibels does not result in a noticeable change in sound. This phenomenon is best explained by
A. the volley principle.
B. selective attention.
C. Weber's law.
D. perceptual constancy.
Answer: C
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