One problem with allowing cell phones in the classroom is that they can be used for harmful purposes. Kids have learned how to bully one another through text messages and social media. Bullying, even by phone, can have permanent, unhelpful effects on kids’ self-esteem. Select the best revision for the paragraph.

Change the word "harmful" to "bad."
Change the word "purposes" to "things."
Change the word "bullying" to "teasing."
Change the word "unhelpful" to "destructive."