What mode of writing is used in this paragraph from The Hiding Place?

"The warm sun beat down on the motionless train, the temperature in the packed car rose, the air grew foul. Beside me someone was tugging at a nail in the ancient wood of the wall. At last it came free; with the point she set to work gouging the hole wider. Others around the sides took up the idea and in a while blessed whiffs of outside air began to circle about us."

description
narration
persuasion
exposition