Read this informal outline of the passage.

Main idea: What teenagers should know about hearing loss

- Volume should be turned down while listening to music devices with earphones

- blankblank

- Genetics plays a role

Which of the following completes the blank line in the informal outline of the passage?

a.
Visiting a hearing specialist is recommended

b.
Damage to eardrums cannot be repaired

c.
Going to concerts at an early age is not a good idea

d.
Overexposure to loud cafeterias should be avoided