Combine the following sentences into a single compound sentence:
The last movie ended after my curfew. We went bowling instead
1. The last movie ended after my curfew, which is why we went bowling instead.
2. The last movie ended after my curfew; we went bowling instead.
3. We went bowling because the last movie ended after my curfew.
4. Since the last movie ended after my curfew, we went bowling instead.