Question

the root phon means sound. what does the word headphones mean?
a device you put on your ears that lets you listen to sounds or music
a device you put on your eyes that lets you see things more clearly
a device you put on your head to keep it protected when you ride a bicycle
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Explanation:

The root "phon" means sound. "Headphones" is a compound word. Analyze the structure: "head" (related to the head) + "phon" (sound). The description "a device you put on your ears that lets you listen to sounds or music" fits headphones.

Answer:

A device you put on your ears that lets you listen to sounds or music.