(B) : The spongocoel is the central body cavity found in sponges ($Phylum$ $Porifera$). This cavity is lined by highly specialized flagellated cells k

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(B) : The spongocoel is the central body cavity found in sponges ($Phylum$ $Porifera$). This cavity is lined by highly specialized flagellated cells known as choanocytes or collar cells. These cells play a crucial role in creating water currents and capturing food particles.