Explanation:

- The accused used a brass disk similar to a fifty paisa coin to obtain a cigarette from a vending machine.

- Theft involves taking someone else's property with the intent to permanently deprive them of it.

- Extortion involves obtaining something, especially money, through force or threats.

- Criminal Breach of Trust involves dishonestly misappropriating or converting someone else's property, which was entrusted to you.

- No offence implies no legal wrongdoing occurred.

Correct Answer: Option 3 - Theft.