Which of the following statements are true?
$(i)$ Sudden action in response to something in the environment is called reflex action.
$(ii)$ Sensory neurons carry signals from the spinal cord to muscles.
$(iii)$ Motor neurons carry signals from receptors to the spinal cord.
$(iv)$ The path through which signals are transmitted from a receptor to a muscle or a gland is called a reflex arc.

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