다음 문장을 한 문장으로 바르게 바꾼것은?
보기 : the dog is mine, it is running in the field.

1. the dog is mine that is running in the field.
2. the dog who is sunning in the field is mine.
3. the dog which is running in the field is mine.
4. the dog is mine which is running in the field.
5. the dog that it is running in the field is mine.

답이 몇번인가요?

급해요. ㅜㅜ