ASAPPPPP!!!

Reading the following description.
The town was a real metropolis. One stop light. Horse tied
up outside a feed store. The only movement was an
occasional tumbleweed. Reminded me of Times Square on
New Year's Eve. A hub of activity, really.
Which words most contribute to the sarcastic tone of the description?
A. Real, really
B. Tumbleweed, feed store
C. One stop light
OD. One, only