Which among the following have an open circulatory system?
$(i)$ Arthropoda
$(ii)$ Mollusca
$(iii)$ Annelida
$(iv)$ Coelenterata

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