From the choices below, select the activities for which the nervous system is responsible.
a: digesting food to produce energy
b: quickly moving your hand off of a hot stove
c: feeling pain
d: identifying an odo
(click all apply)

B. is the answer because the nervous system send nerves down your body telling your hand to move its a reaction to the pain of the hotness your felling 

Is responsible for Sending, receiving, and processing nerve impulses throughout the body. All the organs and muscles inside your body rely upon these nerve impulses to function. 

Mitochondria produce atp, a high energy compound. atp is used for all sorts of enzyme-mediated reactions, such as making proteins/nucleotides/etc, certain compounds cross the cell membrane, muscles move, etc.  without this source of energy, a cell will die. it will not be able to repair itself, defend against pathogens, etc.