Select the correct option regarding the circulatory system.

  • A
    In an open circulatory system,blood is pumped out of the heart into blood vessels that open into body cavities (sinuses).
  • B
    $A$ closed circulatory system is more advantageous as the flow of fluid can be more precisely regulated.
  • C
    In a closed circulatory system,blood flow can be easily controlled.
  • D
    All of the above.

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