Question

the organ of corti is present in the scala vestibuli scala tympani external auditory canal cochlear duct

Explanation:

The organ of Corti is a sensory structure in the inner ear. The cochlear duct (also known as the scala media) contains the organ of Corti. The scala vestibuli and scala tympani are filled with perilymph and are not the location of the organ of Corti. The external auditory canal is part of the outer ear and has no relation to the organ of Corti.

Answer:

cochlear duct