The correct answer is - option D. peripheral nervous system.
Explanation:
The painful sensation is carried to brain by the neurons in the peripheral nervous system that follows the pathway which has three main stages. When one stubs one's toe, the painful sensitivity is the first stage that is followed by the second stage in which signals are transmitted to the dorsal horn from the periphery. Dorsal horn is the structure is present in the spinal cord through the PNS.
