Which is the correct sequence of the components of a reflex arc?

• A
  Receptors $\to$ Sensory neuron $\to$ Spinal cord $\to$ Motor neuron $\to$ Muscle
• B
  Receptors $\to$ Motor neuron $\to$ Spinal cord $\to$ Sensory neuron $\to$ Muscle
• C
  Receptors $\to$ Spinal cord $\to$ Sensory neuron $\to$ Motor neuron $\to$ Muscle
• D
  Receptors $\to$ Muscles $\to$ Sensory neuron $\to$ Motor neuron $\to$ Spinal cord