Explanation:

- Causing simple hurt: Generally considered an offence as it involves inflicting physical pain or injury to another person, although the severity might be minimal.

- Grievous hurt: This is definitely an offence. It involves severe physical harm that can lead to long-term damage or serious health consequences for the victim.

- Voluntary causing of hurt: Also an offence as it involves intentionally inflicting harm or pain on someone, which is a punishable act under most legal systems.

- None of the above: This option implies that all the given actions are considered offences.

Correct Answer: Option 4 - None of the above