Carl has been under stress for a long time. the stress first started when carl's grandfather had a heart attack. carl took charge of his grandfather's round-the-clock care. carl acclimated to his new routine, and was able to manage. however, lately, carl doesn't know how much longer he can go on. carl is starting to get sick a lot, and carl's own doctor has told him that he is showing signs of stress-related illnesses. carl's development of stress-related illness corresponds to which stage of the general adaptation syndrome