(A) The central cavity found in all sponges is known as the $Spongocoel$ or $Paragastric$ $cavity$.This cavity is lined with flagellated cells called

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(A) The central cavity found in all sponges is known as the $Spongocoel$ or $Paragastric$ $cavity$.This cavity is lined with flagellated cells called $Choanocytes$ (collar cells),which help in creating water currents and capturing food particles.Therefore,the correct option is $A$.