According to Your Textbook, Why Was It Necessary for Steven's

According to your textbook, why was it necessary for Steven's law to modify Fechner's law?

A) Fechner's law stopped short of creating a calculable relationship between sensation and perception.
B) Fechner's law did not apply to all stimuli and senses.
C) Fechner's law postulated exponential changes in magnitude in place of arithmetic or geometric changes.
D) Fechner's law proposed a one-to-one correlation between sensation and perception.