During the internship， why does Chris have much fewer working hours than others？

During the internship， why does Chris have much fewer working hours than others？
A、 He has to make more phone calls than other people.
B、 He is always interrupted by other people.
C、 He has to pick up his son and rush to the church.
D、 He has to do a lot of favors for his director.
正确答案： He has to pick up his son and rush to the church.