The reflex arc is the fastest way the body has to move a body part from danger or away from the source of pain. Have you ever noticed your own reflex response? Did you notice that you felt the pain after you yanked your hand away from the source of pain? 

Which is the sequence of structures involved in a reflex response?

Select one:

a. sensory neurons → interneurons → motor neurons → effectors

b. motor neurons → effectors → brain → sensory neurons → interneurons

c. effectors → sensory neurons → brain → motor neurons

d. sensory neurons → motor neurons → interneurons → effectors