The path of water in a sponge is:

  • A
    Dermal ostia $\to$ Gastral ostia $\to$ Osculum
  • B
    Dermal ostia $\to$ Gastral ostia $\to$ Spongocoel $\to$ Osculum
  • C
    Osculum $\to$ Spongocoel $\to$ Choanocytes $\to$ Ostia
  • D
    Pinacocytes $\to$ Choanocytes $\to$ Enteron $\to$ Osculum

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