Which description best captures how some of the pictures in "The Adventure of the Six Napoleons" affect the story's mood?
A. The pictures that show events that take place at night help create a foreboding or uneasy mood.
B. The pictures that show events that take place in Holmes's house help create a jovial or joyous mood.
C. The pictures that show events that take place in London help create a restless and confusing mood.
D. The pictures that show events that take place in the morning help create a hopeful or refreshed mood.