Arousal can be defined as an imbalance between demand and response capabilities.

That statement is false

Explanation:

imbalance between demand and response capabilities is called stress, not arousal. (for example, a person can experience a stress if there is an imbalance between the time that he/she spend to work with the time that that person use to relax and have fun)

Arousal is different from this definition because  occurs when we have some sort of excitement because of the things that we do or the situation that we face.

d is the correct answer.

b is incorrect because it makes food by itself

c is incorrect because us humans don't know how to produce their own food using the sun like plants.

a is incorrect because consumers can depend on carnivores for eating food for consumers to eat the dead organism. same thing with omnivores.

answer; the parasympathetic nervous system;