I slept for most of the day , as I was exhausted . Then , Holly and I hung out for awhile , before taking the bus into Denver to catch up with a bunch of her writing friends . ( Holly writes too ! She 's good !
What may be the reason for them being so exhausted ?
Pick the best answer from the following options:
A. They have a medical condition that causes restlessness .
B. They have n't been sleeping well .
C. They are pregnant .
D. They have insomnia .


B