A Parent Comments That Her Infant Has Had Several Ear

A parent comments that her infant has had several ear infections in the past few months.Why are infants more susceptible to otitis media?

A) Infants are in a supine or prone position most of the time.
B) Sucking on a nipple creates middle ear pressure.
C) They have increased susceptibility to upper respiratory tract infections.
D) The eustachian tube is short, straight, and wide.