Which type of neurons stimulate muscles to contract in a reflex arc?

Explanation

Motor, or efferent, neurones carry impulses away from the central nervous system to the effector, which in this case is a muscle that contracts. Sensory and afferent are two names for the same thing, neurones carrying impulses inwards, which is why both appear as options. Interneurones link the two inside the spinal cord but do not reach the muscle.