It could be inferred that the complete sentence is: "Society will be better off if there were no bullies."
Who is a bully?
A bully is someone who makes it a habit to constantly harm or seek to harm and or intimidate others who they think are vulnerable.
From the above phrase, it can be inferred that the best phrase that completes the sentence is: Society will be better off if there were no bullies." This is because, the theme is about School Bullying.
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