Answer:
c. exhaustion
Explanation:
Hans Selye has explained the three distinct stages involved in the GAS or general adaptation syndrome that is responsible for the body to deal with different stressors.
Exhaustion stage: This is considered as the third and the last stage in the GAS because an individual's energy resources are being depleted in this stage through continuous trying to reach the former alarm reaction stage yet failing. If an individual's body reaches to the exhaustion stage then his or her body is not capable of fighting the stress and therefore feels tiredness.