If a witness to an offense refuses to identify herself to an officer, what offense has she committed?

In this scenario, the appropriate choice is that the witness has committed no offense. A witness has the right to remain anonymous and is not legally obligated to provide personal identification to law enforcement unless requested under specific circumstances.

While certain situations may encourage witnesses to come forward and provide information, refusal to identify oneself does not inherently obstruct justice or constitute any criminal activity. It's important to recognize that while cooperation with law enforcement can be beneficial in investigations, individuals are not compelled to reveal their identities under all circumstances.

Understanding this principle helps clarify the boundaries of legal obligations for witnesses, ensuring that citizens maintain their rights while also recognizing the role of law enforcement in gathering information.