Increases in the occurrence of hearing loss among teenagers are due in part to their listening to loud music through stereo headphones. ██ █ █████ ██ █████████ ███████ ██ ████████████ ████ █████████ █████████████ ███████ ██ █████ ███████ █████ ██████ ██████████ ████ █████████████ ████ ███ ████ █ █████████ █████ ██ ████████ ██ ████████ ██ ██ █████ ████ ████████ ██ ████ ██████████████ █████ ███ █████████████ ██████ ███ ██████████ ██ ███████ ████ ██ ██████████ ████████ █████ ██████ ███ ██████ ██████████ ████ █████████ ███ ███ ██████ ██ ███ █████████ ███████████
The author concludes that headphone manufacturers would not help stop teen hearing loss by making available headphones that turn off when a dangerous level of loudness is reached. Why not? Because teens generally buy headphones themselves.
The author assumes teens would choose not to buy headphones that turn off when a dangerous level of loudness is reached. Otherwise, who's buying the headphones wouldn't make a difference to whether these products would be helpful.
Which one of the following, ██ █████ ████████ ███ ████ ███████ ███ ███ █████████
Loud music is ████ █████████ ██ ███████ ████ ██ ██ ██████ ███████ ██████ ███████████
No other cause ██ ███████ ████ ██ █████████ ██ ██ ████████ ██ █████ █████████ ██ ████ █████ ███████ ██████ ███████████
Parents of teenagers █████████ ██ ███ ██████████ ██████ ██ ████ █████ ███████ ██████ ███████████
Teenagers who now ██████ ██ █████ ██ ███████████ ████ ██████ ██████ ██ ██ ██ ███████ █████ █████████ ██ ███ █████ █████████
A few headphone █████████████ ███████ ████ ██ ██████ ██████ ██████████ ████ █████████████ ████ ███ ████ █ █████████ █████ ██ ████████ ██ ████████