Explanation:

In this scenario, X witnesses Z committing what appears to be a murder and acts on this belief:

- X acts in good faith, thinking Z is committing a murder.

- The law permits citizens to apprehend individuals they believe are committing a crime.

- X seizes Z to bring him before authorities.

- However, Z is later found to be acting in self-defense, not committing murder.

Options:

1. No offence: X acted in good faith without the intention to commit a crime.

2. Wrongful restraint: Involves deliberately preventing someone from moving freely.

3. Wrongful confinement: Involves restricting someone's personal liberty within limits.

4. Assault: Involves intentionally causing someone to fear immediate harm.

Given X’s good faith action and lack of intent, Option 1: No offence is the correct choice.

""