Some college students drink too much alcohol at school. Many of them live on the campus. Heavy drinking has caused many problems. It can cause students to make bad choices and do dangerous things.One college has decided to ban alcohol. It has gotten a reputation as a party school. Five students at the college have died from drinking too much alcohol. Recently, one student drank too much vodka. He slipped into a coma. The college hopes the new rule will prevent any more tragedies.The new rule prohibits students from drinking alcohol in the dorms. The first time a student breaks the rule they will receive a warning. If they break the rule again, they will be evicted from the dorm. However, they will still have to pay for the dorm. Some students do not live on the campus. They live in houses near the campus. Those students are also banned from drinking alcohol, even if they are of legal age.Freshmen at the college are now required to take a special course. The course is called AlcoholEdu, and lasts for two and a half hours. The students learn about the dangers of alcohol. They also take a survey to find out how much they know about alcohol. All first-year students must pass the course.The college hopes that more information will help students make better choices. How do officials know that alcohol is a problem at the school（）

A. Students are getting bad grades.
B. There are too many bars on the campus.
C. Only a few students drink.
D. Several students have died and one is in a coma.