Independent Clauses

Can this clause stand on its own? When the dog finally stopped barking.

Can this clause stand on its own? While we were listening to the music.

Which of these is NOT a clause?

Can this clause stand on its own? Which proves that theory wrong.

Can this clause stand on its own? One car seemed to go much faster than the other.

Which of these is a clause?

Can this clause stand on its own? Every year the elephants cross the desert in search of water.

Which of these is a clause?

Is this an independent clause? Plagiarism is a concerning issue.

Is this a clause? When the weather improves.