Answer:
A. direction in which they carry impulses
Explanation:
Neurons are classified on the basis of direction in which they carry impulses. There are three main categories of neurons: sensory neuron, motor neurons and interneurons. The sensory neurons transmit the sensory information from sensory receptors to central nervous system (CNS) while motor neurons carry the motor information from CNS to the effector organs. Interneurons carry impulse from one neuron to another.
