Which of the following crimes involves unlawfully restricting someone's personal liberty?

The crime that involves unlawfully restricting someone's personal liberty is known as false imprisonment. This offense occurs when an individual is confined or restrained against their will, without legal justification. The essential element of false imprisonment is the deprivation of freedom of movement; the victim must feel that they cannot leave a particular area due to the actions or threats of another person.

For instance, if a person is physically held in a room with no way to exit or is coerced into staying in a location through threats, it constitutes false imprisonment. The focus is on the restriction of liberty, rather than property (as in robbery), the threat of physical harm (as in assault), or disturbances to public order (as in breach of peace). Thus, the core of the definition of false imprisonment centers around the unlawful deprivation of a person's freedom, making it the correct choice in this context.