Explanation:

- Option 1: Question of fact

- Whether grave and sudden provocation existed depends on what actually happened in the specific incident, like what was said or done and how the person reacted.

- It's about the actual circumstances and how a common person would respond.

- Correct Answer

- Option 2: Question of law

- This would mean that it’s for a judge to decide, based on legal principles, regardless of the facts.

- This is not correct for grave and sudden provocation.

- Option 3: Mixed question of fact & law

- This is about applying legal definitions to the facts, but primary determination is factual.

- Grave and sudden provocation is mainly factual.

- Option 4: None

- Not relevant here.