According to Malala in “Profile: Malala Yousafzai,” why are her classmates “not too excited” about their winter vacation?

A. They are too poor to travel and will not enjoy the time off.
B. They are afraid to be at home when the Taliban are nearby.
C. They believe that their school may remain closed even after the holiday.
D. They are concerned that a government military operation may damage the school.