Unlike Schizophrenia or an eating disorder, personality disorders can be viewed as disorders of biology rather than learning. So, A is your answer.
Explanation:
This is because personality disorders can be caused through multiple genetic factors in an individual, like family medical history; dysfunctional home lives, and a number of other things.
The reason is dehydration. His body is low on water and can't function without it so he is getting hot because his body doesn't have enough to water to cool it down. Hope this helped!