Some statements about heavy water are given below:
$(i)$ Heavy water is used as a moderator in nuclear reactors.
$(ii)$ Heavy water is more associated than ordinary water.
$(iii)$ Heavy water is more effective solvent than ordinary water.
Which of the above statements are correct?

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