Respuesta :
Answer:UCS; UCR---c
Explanation:
UCS (Unconditioned stimulus is any stimulus that can trigger or cause a response without the subject having any knowledge of that stimulus, which leads to the subject giving an Unconditioned response(UCR) which occurs spontaneously and due to reflex.
Shining a bright light directly into a person's eye,will cause an UCR because the pupil of the person eye will reflexively constrict. The bright light that triggered the reflective response is the UCS.