As you enter the kitchen after school you can smell chocolate chip cookies baking. This scent causes you to salivate. Your salivation is best explained by:

Answer: reflex (involuntary) action

Explanation:

Salivation, after smelling baked cookies is best described as a reflex action, i. e it is a rapid, automatic and unconscious response that would always occur regardless of time or environment.

Other examples of reflex actions are

- blinking of the eye

- withdrawal of hand from hot objects etc