Fechner Proposed Two Ways to Measure the Lowest Level of a Sensation.One

Fechner proposed two ways to measure the lowest level of a sensation.One was the point of stimulus intensity below which no sensation is reported and above which subjects do experience a sensation;the other was ____.​

A) ​whether or not a stimulus is present or absent,sensed or not sensed
B) the point of sensitivity at which the least change in a stimulus results in a change of sensation
C) ​the level at which two points of stimulation can be distinguished
D) the smallest difference that can be detected between two physical stimuli
E) None of the choices are correct.