What is absolute threshold?

A. The absolute maximum of stimulation that an organism can take before it has sensory overload.
B. The absolute minimum of stimulation that it would take for an organism to perceive something happening around it.
C. The minimum amount of physical energy change required to produce a difference in sensation.
D. The point a person reaches just before experiencing a nervous breakdown.

B. The absolute minimum of stimulation that it would take for an organism to perceive something happening around it.