Context: So well my 4th semester at Chaffey started last week . Got to say my classes are really boring . Well I have Alyssa in my math 420 class . Well my history 21 class I can not tell if it is boring or not because I only spent one day with my teacher and on thursday we had a substitute in this class and it was so hot in the classroom that the sub decided that all we had to do was sign in and leave .

Question: What may be the reason why it was so hot in the classroom ?
Options:
0. Because the furnace is broken .
1. Because they had the heat all the way up .
2. Because the air conditioner is broken .
3. Because they did n't want to have class that day .
Answer: 2