What Is the Minimum Number of Neurons Necessary for a Stretch

Multiple Choice

What is the minimum number of neurons necessary for a stretch reflex?

A) 2: one sensory neuron and one motor neuron
B) 3: one sensory neuron, one interneuron, and one motor neuron
C) 4: one sensory neuron, one inhibitory neuron, and 2 motor neurons
D) 5: 2 sensory neurons, one inhibitory neurons, and 2 motor neurons
E) The number of neurons in the stretch reflex depends on the strength of the stimulus.