Which of the following statements are correct?
$(i)$ $Ramus$ $dorsalis$ branch of spinal nerve contains sensory as well as motor nerve fibres.
(ii) The preganglionic nerve fibres arise from the entire spinal cord.
(iii) There are $31$ pairs of spinal nerves.
(iv) The somatic nervous system transmits impulses from $CNS$ to visceral organs.
$(v)$ Reflex action is a sudden,thoughtful,and voluntary response to the applied stimulus.
Select the correct option.

• A
  $(i)$ and (ii) only
• B
  (ii) and (iv) only
• C
  $(i)$ and (iii) only
• D
  (iii) and $(v)$ only