Agroup of high school students are upset with the new dress code implemented by the school district. in response, they created an "underground" school newspaper that they self-published to poke fun at the rules and the administrators who enforce them. under these circumstances, school administrators:

I believe the answer is :could neither discipline the students over the paper nor demand the right to review future copies under Hazelwood v. Kuhlmeir.

The 'underground' newspaper that made by the students Are NOT considered as school property since they published it without using school property.
Under the result of Hazelwood v. Kuhlmeier , such actions are protected by the free speech clause on the first amendment, so the students have the full right to spread the paper as they please.