Which of the following is a violation of the free exercise clause of the First Amendment?

A public school preventing its students from forming prayer groups

A state law prohibiting an individual from keeping a gun in his home

An employer preventing an employee from speaking his opinion about the new employee regulations

A newspaper being prevented from printing an unflattering, but truthful, article about the governor of a state

A state government procuring a person's home to build a new local roadway without paying any money for the home