A 17-Year-Old Student Is a Swimmer on Her High School's

A 17-year-old student is a swimmer on her high school's swim team.She has had three bouts of otitis externa so far this season and wants to know what to do to prevent it.The nurse instructs her to:

A) use a cotton-tipped swab to dry the ear canals thoroughly after each swim.
B) use rubbing alcohol or 2% acetic acid eardrops after every swim.
C) irrigate the ears with warm water and a bulb syringe after each swim.
D) rinse the ears with a warmed solution of mineral oil and hydrogen peroxide.