Answer:
-salivating at the thought of a hamburger
Explanation:
An autonomic body function is something that the body does without you having to consciently do it, walking is a conscient decision, picking up something from the ground is a conscient decision, but breathing for example, is an autonomic body function, or digestion is an autonomic body function, you can not stop it or start it, from the options the only thing that is an autonomic body function is salivating when thinking of food.
