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 .
According to the above context, choose the best option to answer the following question.
Question: Why is this the only solution ?
Options:
- 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 .


Because the relationship ca n't be carried out at school .