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 .
Why would the air in the bus be turned on ?
Pick the best answer from the following options:
A. None of the above choices .
B. To help with mental switching their train of thought .
C. To block out external noise when they close their eyes to sleep .
D. To raise the temperature and combat the cool air .


A