What is the direction of the water flow in organisms belonging to the phylum Porifera?

  • A
    Ostia $\rightarrow$ Spongocoel $\rightarrow$ Osculum
  • B
    Osculum $\rightarrow$ Spongocoel $\rightarrow$ Ostia
  • C
    Ostia $\rightarrow$ Osculum $\rightarrow$ Spongocoel
  • D
    Spongocoel $\rightarrow$ Osculum $\rightarrow$ Ostia

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