Which action could lead to charges of unlawful restraint?

The action that could lead to charges of unlawful restraint is confining someone against their will. Unlawful restraint typically involves restricting an individual's freedom of movement without their consent, which can occur in various forms, such as physically holding them in one place or preventing their exit from a location. This action directly impacts the person's autonomy and freedom, forming the basis for potential legal charges.

In contrast, the other scenarios presented may not necessarily fulfill the legal criteria for unlawful restraint. Holding a person's hand is often consensual, walking with someone unwillingly may not involve actual confinement, and greetings without consent typically do not constitute a level of physical control or restraint necessary for such charges to apply.