D.) exercise burnout.
When you exercise too much, it becomes unhealthy and pointless.
U.S Food and Drug Administration (FDA)
Symptoms of acute HIV infection can include:
rash
fever
chills
headache
fatigue
sore throat
night sweats
loss of appetite
ulcers that appear in the mouth, esophagus, or genitals
swollen lymph nodes
muscle aches
diarrhea
Stabilizing selection... I think it might be right if I'm wrong, sorry if I am.