The correct option is C Statocyst
The statocyst is a balance sensory receptor present in some aquatic invertebrates, including bivalves, cnidarians, echinoderms, cephalopods and crustaceans like prawns. Whereas, otolith is the structure in the saccule of the inner ear, in the vestibular labyrinth of vertebrates. Lateral line organ is unique to the aquatic vertebrates that serve to detect movements and pressure changes in the surrounding water. The structure formed by the invagination of the embryonic tissue that develops into the inner ear is otocyst.
Therefore, the correct answer is option D.