Final answer:
A motor neuron transmits impulses away from the CNS to muscles or glands, classifying it as an efferent neuron in the peripheral nervous system.
Step-by-step explanation:
A motor neuron transmits impulses away from the central nervous system (CNS) toward muscles or glands. Therefore, the correct answer to the question is 'E. away from the CNS'. These neurons are part of the peripheral nervous system (PNS) and are classified as efferent neurons, which means they carry signals away from the CNS to effectors such as muscles or glands, enabling movement and responses to stimuli. This is in contrast to sensory or afferent neurons, which transmit impulses toward the CNS.