Explanation:

- The main statement "I ______ home before she arrived" indicates a sequence of events in the past.

- Option 1: "had left" - This is the past perfect tense, suitable for showing that the action of leaving happened before another action in the past. This is the correct option.

- Option 2: "left" - Simple past tense. This suggests a single past action, not ideal for emphasizing an action completed before another past event.

- Option 3: "has left" - Present perfect tense. It connects past actions with the present, not appropriate for the past sequence of events here.

- Option 4: "have left" - Present perfect tense. Again, not suitable for describing sequences completed in the past.