Read the following context and choose the best option to answer the question.
Context: I just got back from a grueling family reunion . No , the family was n't the problem . I had volunteered to do all the cooking , and for three days , I was running a little restaurant . I ' m back home now , and just about recovered .
Question: What may be the reason for them being so tired ?
Options: 
- All the chores they had to do .
 - None of the above choices .
 - They did n't get any sleep the night before .
 - All the work they had to do .


All the work they had to do .