Read the following context and choose the best option to answer the question.
Context: Plus , taking twelve units has been immensely freeing so far , and I have every intention of actually SLEEPING this semester . I mean like seven - hours - a - night sleeping , you guys . Last semester my average was five ... so this is pretty big for me .
Question: What may be the reason they only slept 5 hours ?
Options: 
A. They only had one class but it was very boring .
B. They took too much time getting ready for sleep .
C. They stayed up all night pretending to study for class .
D. None of the above choices .


D