Unlike outside and backstage , it was cool in the bus . He mentally thanked their bus driver for switching on the airco this morning as he made his way to the living room area . He flopped down on the large , brown sofa and closed his eyes , sighing again .

Question: Why would the air in the bus be turned on ?
Answer: None of the above choices .To block out external noise when they close their eyes to sleep .To combat the sunny weather outdoors .To raise the temperature and combat the cool air .