As molly is walking across campus, a car swerves toward her. her heart races and sweat breaks out as she jumps out of harm's way. this mobilization of energy is due to the action of molly's nervous system.

The correct answer will be- sympathetic nervous system

Explanation:

The sympathetic nervous system is a part of the autonomic nervous system which produces fight or flight response.

The sympathetic nervous system responds to the stimulus by producing a neurotransmitter called acetylcholine which binds nicotinic acetylcholine receptors and activates them.

The activation of the receptors releases the nor-adrenaline and continuous response release the adrenaline from the adrenal medulla of the kidney. These chemicals produce the fight or flight response like the dilation of the pupil, increased heartbeat and others.

The jumping, heart race and the sweat observed in Molly this is due to the activation of the sympathetic nervous system.

Thus, the sympathetic nervous system is the correct answer.