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 .
According to the above context, choose the best option to answer the following question.
Question: Why would the air in the bus be turned on ?
Options:
- None of the above choices .
 - To help with mental switching their train of thought .
 - To block out external noise when they close their eyes to sleep .
 - To raise the temperature and combat the cool air .


None of the above choices .