We also saw horses ... and almost hit a deer . We tried to get Holly to watch the Demitri Martin CD , but she fell asleep . Instead , we all packed up and gave in to slumber . In the morning , we got up early , and drove back out to Assateague . There were n't too many people on the beach .
According to the above context, choose the best option to answer the following question.
Question: Why might Holly have fallen asleep before anyone else ?
Options:
A. Holly did n't like the Dean Martin CD and opted for slumber instead .
B. They got up early and went to Assateague so she did n't sleep well the night before .
C. None of the above choices .
D. She was not used to so much fresh air and it made her feel sleepy .


D