Your answer would be:
Explanation:
A) A boost of energy- When you are becoming dehydrated you don't get a sudden boost of energy. Instead of having a whole bunch of energy, you won't have much energy.
B) Feeling of happiness- When you are becoming dehydrated you will most likely not be happy. You would be tired, and wanting to stop.
C) Onset of a headache- When you are dehydrated many people tend to have onset headaches. Headaches are a common sign of dehydration in many people. That being said, Oneset of a headache is the answer.
D )Release of endorphins- This answer isn't correct because, endorphins basically make you think positive, and it reducues pain.