Read the excerpt from "Saying 'No' to Homework."

Working on homework late at night can disrupt sleep. Sleep is vital for the brain to work well. Students who don’t get enough sleep have a hard time remembering what they learned. They also have a hard time paying attention in class. They don't have to lose a great deal of sleep to feel the effects. Studies show that losing small amounts of sleep can have an impact.

One study looked at students in grades four and six. The researchers asked the students to change their sleep schedule for three nights. Some students got an extra hour of sleep. The others got one less hour of sleep each night. Then, the researchers tested the students. Students who lost an hour of sleep performed as if they were two grade levels lower than they really were. Other studies have also found that one extra hour of sleep makes a big difference. Giving up sleep to do homework isn't a good trade.

Which sentence is the best example of evidence that shows that sleep is more important than homework?

A.Working on homework late at night can disrupt sleep.
B.Students who don’t get enough sleep have a hard time remembering what they learned.
C.Students who lost an hour of sleep performed as if they were two grades lower than they really were.
D.Giving up sleep to do homework isn’t a good trade.