Jose and Carlos Were Both Hired to Work the Night

Jose and Carlos were both hired to work the night shift at the local canning factory. Jose sleeps when he gets home from about 7am until 3pm during the week and then sleeps at night on the weekends so that he can spend time with his children. Carlos is not married and tries to sleep at the same time every day, from 7am until 3 pm both during the week and on the weekends. All other factors being equal which of the following statements is most likely true?

A) Carlos becomes unable to keep to his sleep schedule when he occasionally has an appointment during the daytime hours.
B) Carlos is less drowsy on the job and makes fewer errors than Jose.
C) Jose is more successful at keeping the schedule because the weekend night sleep helps him get through the week.
D) Jose is less drowsy on the job and makes fewer errors than Carlos.