Tina's eyes water every time she chops onions. her response is an example of a

I believe the answer is: Reflex

Reflex is an action that performed by our body that happened without conscious thought. Reflect a movement is a form of self-defense mechanism that exists to prevent our body from getting some sort of harm.
Other example of a reflex movement would be when you yanked your hand away if it touch something hot.

Ibelieve its c not quite sure.