The auditory, or eustachian, tube extends from the nasopharynx to theA external ear. B middle ear. C inner ear. D oropharynx.

Option B, Middle ear

Explanation:

Nasopharynx is the upper part of throat which lies behind the nose and it connects the to middle ear. It moves the mucus produced in the middle ear to the throat which is then further drained out.

This tube is responsible for equalizing the pressure inside the ear to the pressure outside the ear. It comprises upper throat and rear side of nasal cavity.

Hence, option B is correct