Explanation:

- X intentionally instigates a child under 7, who cannot be held criminally liable due to Section 82 IPC (doli incapax).

- X’s instigation leads directly to Y’s death, with clear intention to cause death.

- Though X did not administer the poison, he used an innocent agent.

- Law treats acts done through innocent agents as if done by the person who directed.

- Option 1 (No offence): Incorrect, as X had intention and caused death.

- Option 2 (Abetment of murder): Incorrect, as X is principal, not just abettor.

- Option 3 (Murder): Correct. Law holds X directly liable for murder because he used the child merely as an instrument.

- Option 4 (Culpable homicide not amounting to murder): Incorrect, as X’s actions showed intention to kill.