I think its Laertes idk ig im right :/
The preposition in question is "on", and its purpose is to show you where the dog chewed. You can remove the preposition to form the sentence "The brown dog chewed the rawhide bone." You can also rearrange it to find the preposition, "on the rawhide bone, the dog chewed" in what is commonly known as the Yoda technique.
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A sounds like it fits the best
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I decide it's best to do something. It's not the first time it's happened, meaning that it's going to happen again. Not doing anything is basically the same thing as being a bully. I decide to tell a trusted adult so that the bullies can get what they deserve and that student can stop being bullied. It's the right thing to do and it solves things.
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I hope this helps :)