The scenario allowed under the free-exercise clause is when a parent leads a prayer in a public park.
The Free Exercise Clause of the First Amendment protects individuals' rights to freely practice their religion without government interference. It prohibits the government from restricting religious practices unless there is a compelling interest to do so. In the given scenarios, the scenario allowed under the free-exercise clause would be a parent leading a prayer in a public park. This is because it involves an individual freely exercising their religion in a public space without government intervention or establishing a particular religion.