Physicians Become Very Concerned When a Person's Body Temperature Rises $\degree$

Physicians become very concerned when a person's body temperature rises above 40 $\degree$ C (104 $\degree$ F) since

A) many enzymes essential to life will be negatively affected, i.e., denatured or slowed in their actions.
B) nerve impulses will stop completely at this temperature.
C) the patient will lose the ability to communicate.
D) cell respiration will increase to the point of exhaustion.