An old man with steel-rimmed spectacles and very dusty clothes sat by the side of the road. There was a pontoon bridge across the river and carts, trucks, and men, women and children were crossing it. The mule-drawn carts staggered up the steep bank from the bridge with soldiers helping to push against the spokes of the wheels. The trucks wound up and away heading out of it all. The peasants plodded along in the ankle-deep dust. But the old man sat there without moving.
The refercnce to the old man in the beginning and the end of the passage indicates that :

Options

A. the writer wants to compare between the bridge and motionless old man
B. the description that takes place between the first sentence and the last sentence is irrelevant
C. there is an unnecessary repetition in the reference of the old man
D. the figure of the old man is brought under a sharp focus