Answer:
The answer is a. absolute threshold.
Explanation:
The absolute threshold is described as the minimal perceptible level of a stimulus. In the example, the threshold is auditory.
A common way of measuring one's hearing absolute threshold is to gradually increase a sound frequence until the person starts perceiving the sound. However, the stimulus must be identified at least 50% of the time.
Most people's absolute thresholds decline with age.
