I would say A, advertisements
Answer: To illustrate Japan's isolation in the 1800s.
Explanation: The outside source in this excerpt (the first few lines) clearly describes how while the rest of the world was dealing with monarchies, wars and developing new technologies like trains and wheels, Japan decided to be totally closed off from all of that, and they concentrated just in painting screens for 200 years.
Reversal - to change opposite directions
I took an left but had to go reversal
At the end
The guy walking
