In the Nineteenth Century, a Psychophysicist Named Ernst Weber Found

In the nineteenth century, a psychophysicist named Ernst Weber found that:

A) for each stimulus there is an equal but opposite reaction
B) the amount of change that is necessary for a stimulus to be noticed is systematically related to the intensity of the original stimulus itself
C) increasing the amount of stimulus will lead to adaptation
D) the ratio between stimulus and response is a fixed proportion
E) Solomon's Law was valid