The Eustachian tube becomes longer, narrow, and more slanted during middle childhood, resulting in reduced incidence of otitis media. Thus option D is correct.
A tube like opening that connect the middle ear with the nasal-sinus cavity called as auditory tube or Eustachian tube
It helps balancing the pressure of middle ear, clear secretions, and protecting it from pathogens.
In normal condition the tube is closed and opens periodically during yawning and swallowing.
The changes in outside air pressure also causes opening of this tube which allow air to move from the ear canal to the middle ear.
If the tube open continuously due to some reason can lead to a feeling of pressure as well as hearing unusual sounds like own breathing sound.
It also causes eustachian tube disorders ear infections or otitis media.
Thus option D is correct.
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