Which answer best eliminates wordiness in this sentence?

There are many ways students who are interested in algebra can practice outside the class if they want to.


Students who are interested in algebra can find many ways to practice it outside the class.

Algebra can be practiced many ways outside the class by students interested in it.

If they want to, there are many ways students can practice algebra if they are interested.

There are many ways interested students can practice algebra outside the class.