A person commits an offense if he or she engages in the offense in what manner?

Engaging in an offense voluntarily means that the person has made a conscious choice to commit the act. This implies that the individual was aware of their actions and the nature of those actions, which is a fundamental aspect of criminal responsibility. The legal system generally requires a showing of intent or awareness for a behavior to be classified as an offense. When someone acts voluntarily, they exercise their free will to engage in behavior that is prohibited by law.

The other options pertain to different states of awareness or intention. Involuntary actions refer to movements that are not under the person's conscious control, such as reflexes. Accidentally implies that a behavior was not intended or part of a deliberate act. Unknowingly suggests a lack of awareness of the criminality of the act. None of these conditions fulfill the standard for establishing an offense in the same way that voluntary actions do, as they may absolve a person of legal responsibility due to the absence of intent or conscious choice.