Which situation exemplifies trespassing?

The situation that illustrates trespassing is entering a school without permission. Trespassing occurs when an individual enters a property without the owner's consent or legal authority. In this case, the school is owned or managed by an authority that has established rules about who can enter the premises and under what circumstances. Without proper authorization, entering the school constitutes an unlawful intrusion, which is the defining aspect of trespassing.

In contrast, walking down the street, going to a public park, and visiting a neighbor who invited you involve permissible activities. Streets and public parks are typically accessible to everyone, and visiting a neighbor is allowed as long as there is an invitation, indicating consent to enter the private property.