Severus glared at him , but said nothing for the moment . ' If there were any other way , you know I would be the first one to defend your private life with the girl . But at the present , this is the only solution . There 's no way you can carry on a relationship inside the school 's walls with an unmarried girl .

Question: Why is this the only solution ?
Answer: Because the relationship threatens Severus .Because the relationship ca n't be carried out at school .None of the above choices .Because the relationship is doomed to fail .