The figure below shows the circulatory system of an earthworm. What are $P, Q$,and $R$?

  • A
    $P=$ Ventral vessel,$Q=$ Lateral oesophageal hearts,$R=$ Anterior loops
  • B
    $P=$ Dorsal vessel,$Q=$ Lateral oesophageal hearts,$R=$ Anterior loops
  • C
    $P=$ Ventral vessel,$Q=$ Lateral hearts,$R=$ Commissural vessel
  • D
    $P=$ Dorsal vessel,$Q=$ Lateral hearts,$R=$ Commissural vessel

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