My poor , poor 1st years . Mitsu was n't very energetic today , so he was n't running around , but lots of other boys were . I do n't know what got into them .
According to the above context, choose the best option to answer the following question.
Question: Why was Mitsu and the first years so tired ?
Options:
- They are being deprived of sleep .
 - They are hurting from fighting .
 - They are drained from school .
 - None of the above choices .


They are drained from school .