Which of the following is an example of breaking or entering?

Breaking or entering is typically defined as the unlawful entry into a building or structure with the intent to commit a crime, often associated with theft or other offenses. In this scenario, the example of a homeless individual breaking into a library to sleep clearly fits this definition. This act involves entering a property—specifically, a library—without permission, which constitutes illegal entry. The intent behind this entry, although it may not be to commit a traditional crime such as theft, is to occupy the premises unlawfully, fulfilling the criteria for breaking and entering.

The other options do not embody this concept of unlawful entry. For instance, unlocking a door suggests permission to enter, and trying to enter a public event typically involves a lawful entry process. Meanwhile, a family moving into a new home indicates they have legal possession or permission to be there, making it an entirely lawful act.