Heat exhaustion symptoms can include:
Fatigue
Nausea
Headache
Excessive
thirst
Muscle aches and cramps
Weakness
Confusion or
anxiety
Drenching sweats, often accompanied by cold, clammy
weakened heartbeat
Dizziness
Fainting
Agitation
Heat exhaustion requires immediate attention. Even though, it is probably the least severe heat — related illness.
I would say A. The three other choices could lead to its start.
Nasal sprays it helps alot
