The counter 3本 is used for counting: 3 bottles/pencils (long/thin objects) (Category: 本 (hon) - Long/thin objects, JLPT N5). 三 (san) triggers rendaku (voicing) on the counter, changing 本 (hon) to 'bon'.
Context Example
傘を3本買ってきました。
Kasa o sanbon katte kimashita.
I bought three umbrellas.
Which counter represents "3 bottles/pencils (long/thin objects)"?
Correct! 🎉
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