The correct answer is B) absolute threshold; difference threshold.
The lowest stimulus intensity required for detection is the absolute threshold and the smallest noticeable difference between standard stimulus intensity and another stimulus value is the difference threshold.
The difference threshold is also known as "the just noticeable difference or JND." It is the minimum level of stimulation that an individual is able to perceive fifty percent of the time. In the case of the absolute threshold, it is the smallest detectable level of stimulation.