Which of the structures listed below converts vibrations in the endolymph into action potentials?

Question

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The organ of Corti is the structure within the cochlea of the ear that converts vibrations in the endolymph into action potentials. It contains hair cells that are sensitive to specific frequencies of sound and convert the mechanical vibrations into electrical signals that can be transmitted via the auditory nerve to the brain. The other structures listed (macula, pinna, tympanic membrane, and cupula) are either not involved in the conversion of vibrations into action potentials or are located in different parts of the ear.

Which of the Structures Listed Below Converts Vibrations in the Endolymph