A reflex involving a sensory and a motor neuron is called such transmission.

Explanation

Option A: Synapse: The region where the impulse moves from one neuron to another is called a synapse. Option B: Monosynaptic: A reflex usually involves two neurons, a sensory neuron and a motor neuron. The pathway of such transmission is the reflex arc. In this case, since only one synapse is involved, such a reflex is called monosynaptic. Option C: Reflex arc: A reflex arc is the neural pathway that mediates a reflex action, allowing for a rapid, involuntary response to a stimulus without conscious thought from the brain. This pathway typically involves a sensory receptor, a sensory neuron, a relay neuron (in more complex arcs), a motor neuron, and an effector (like a muscle or gland). Option D: Synaptic cleft: The space between two neurons across which the impulse is transmitted by a neurotransmitter is known as the synaptic cleft.