the figurative wall that existed between them all along
Explanation:
This figurative wall, this separation, is represented in the excerpt as a high green folding screen: <em>" I procured a high green folding screen, which might entirely isolate Bartleby from my sight"</em>.
The answer is A to confirm that the passage is not yet finished. it’s the only one that make sense seeing that fact the More In furthermore is indicating that there is more to be told about something