The counter 9本 is used for counting: 9 bottles/pencils (long/thin objects) (Category: 本 (hon) - Long/thin objects, JLPT N4). 九 is read as 'kyuu' (きゅう) before 本 (hon). It is regular.
Context Example
鉛筆を9本並べました。
Enpitsu o kyuuhon narabemashita.
I lined up nine pencils.
Which counter represents "9 bottles/pencils (long/thin objects)"?
Correct! 🎉
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