根据以下文字回答问题 Getting less than five hours of sleep a night makes people dumber and less able to concentrate, and it can make people more likely to have false memories. In the classroom, students who sleep more in the previous day tend to be better at remembering what they’ve learned than those who slept less. What could be the consequences of lack of sleep? ()

A. Dumber
B. Less able to concentrate
C. False memory